Sealing & resealing bags

Buy from an extensive range of sealable and resealable bags, including grip seal bags, zip seal bags and self-seal bags.

Sealing and resealing bags are...

• Reusable polythene bags that can be opened and closed
• Designed for multiple use - open and close as many time as you like!
• Bags that can be sealed by a variety of means, including self-seal bags

Self-seal bags are...

• Manufactured with an integral sealing strip, located along the bag opening, to allow for easy opening and closure
• Also known as minigrip bags, mini-grip bags, gripper bags, grippa bags and resealable bags
• Ideal for securing bag contents and avoiding leakage or contamination
• Available in a variety styles to suit a range of uses, from storage bags to carrier bags
• Available in clear polythene with or without labels - to make a note of bag contents and help retrieval
• Available in variety of coloured opaque polythene - e.g. red, green, blue or black - to help with item storage and colour-coded retrieval
• Also available in more specialist polythene, from heavy duty grip seal bags to anti-static grip seal bags
• Sometimes referred to as zip seal bags. However…

Zip seal bags are…

• Manufactured with a metal zip fastener or zip seal, making them…
• A more premium bag than a grip seal bag
• Used for storing important documents, such as art portfolios or school project work
• Ideal for use as a wallet for conference delegates or for exhibition attendees
• Also known as zip bags, ziplite bags or zipper bags

Sealable, resealable and self-sealable - there's more than one way to seal a bag

Sealable bags

Any plastic bag that can be sealed shut can be described as a sealable bag.

The sealing process can be carried out by any means, including a bag tie or clip (e.g. a sandwich bag with a twist tie), an adhesive strip, either external (e.g. sealing any bag with cellotape) or internal (e.g. as with a mailing bag), an internal self-seal strip (e.g. as with a minigrip bag) or by heat sealing with an external sealer (e.g. as with vacuum bags).

So any plastic bag that is designed with a seal can be called a sealable bag. However, not all sealable bags can be called resealable bags.

Resealable bags

Only bags where the seal can be reused can be classified as resealable bags. Some bags, such as mailing bags, feature a single-use seal that can't be reused without tearing open the bag itself and thus rendering it useless. Mailing bags are a very convenient way of sending post - thanks to their integral adhesive seal - but, because their seal is strong enough to keep the mail contents secude until the bag is cut or ripped open by the recipient, then a mailing bag is not a resealable bag, although it is a sealable bag.

Self-seal bags

Not every sealable bag be called a self-seal bag. This monicker is reserved only for bags that can be sealed closed without using any external sealing accessory - including adhesive tape, clips or bag ties - and without the use of a heat sealer to melt the polythene and seal the bag.

The most popular types of resealable bags are grip seal bags. These bags, which are sometimes known as mini-grip bags, gripper bags or grippa bags, feature an integral seal that runs along the top of the bag.

The seal contains a male (single) and female (double) ridge of plastic on opposite sides of the bag opening. When the seal is squeezed gently between thumb and forefinger, the male ridge fits snuggly into the female ridges to close the bag. This seal protects the contents of the bag from moisture, dirt and other external contaminants.

It can be used over and over again, which means the grip seal bag is a sealable bag, a self-seal bag and a resealable bag.

This handy bag is available in a huge range of sizes, made from clear, coloured or black polythene, with or without labels to make handy notes on the bag and with specialist options including antistatic bags - to keep electrical components safe - and specimen bags with accompanying record cards - perfect for hospitals, doctors' surgeries and police stations.

Methods of sealing plastic bags

The most common ways of sealing a polythene bag are by:

Sealing the bag with ties or clips. Fasten any bag shut with a plastic clip or twist shut with a tie. A popular method of sealing food bags for domestic use (e.g. clip a packet of frozen peas shut before placing in freezer, twist a sandwich bag closed for a packed lunch etc.)

Sealing the bag with a built-in adhesive flap. Some bags such as mailing bags are manufactured with a flap opening, where the flap contains a built-in adhesive strip attached along its length. Simply remove the cover from the adhesive and press the flap down to seal.

Sealing the bag with a built-in grip or zip seal. A range of bags are available with an integral strip that seals shut either by squeezing the seal together (grip seal) or pulling closed (zip seal). Very handy for regular use as they can be used over and over, these bags also provide great protection from moisture, dirt etc.

Sealing the bag with a heat sealer. If you really want to seal your bag shut tight this is the method for you. A heat sealer will bond two pieces of plastic when placed together in the sealer and the sealer is closed shut. A one-time seal, this method of sealing bags is popular for vacuum packing food.

Where to buy sealing and resealing bags

Resealable bag manufacturers and suppliers include:

Ziplock Bags
The home of ziplock bags online, this website features everything you need on ziplock, zipper, ziplite, grip seal and all self-seal bags. With a huge range of products at great prices and free delivery within the UK, this is the number one ziplock website out there.
www.ziplockbags.co.uk

Self Seal Bags
Specialists in self-seal bags, this website stocks a huge range of resealable bags from grip seal to mini grip and ziplock to ziplite. Packed with loads of useful information to help you choose the right bag for you, with free delivery to UK addresses.
www.self-seal-bags.co.uk

Plastic Self Seal Bags
Discount Self Seal Bags is the place to go to get resealable plastic bags at discount prices. Also features loads of useful information on self-seal bags, including a handy buying guide to make sure you pick the right sort of resealable bag for you.
www.discountselfsealbags.co.uk

Minigrip Bags
A website loaded with information on minigrip bags - aka grippa bags - and all types of self-sealing bags, with list of the best places to buy them online. Features a useful guide to anti-static self-seal bags, what they are used for and how they work.
www.minigrip-bags.co.uk

Zip Seal Bags
Zip Seal Bags contains loads of great information on zip seal bags and other types of self-seal polythene bags and eco-friendly alternatives. It also features a handy list of online zip seal bag retailers.
www.zipsealbags.co.uk

Antistatic Bags
Antistatic bags is the number one website dedicated to antistatic bags. Containing a wealth of information on antistatic packaging and how it works, along with details of where to buy it at the best possible prices.
www.antistatic-bags.co.uk

Resealable Bags
Resealable-Bags is a division of Polybags Ltd, the UK's number one polythene manufacturer, that specialises in resealable bags. Offering an unrivalled range of resealable bags and other polythene packaging at the best prices online.
www.resealable-bags.co.uk

Research & Resources

For plenty more information on sealing and resealing bags, including the manufacturing process, types of self-seal bags available and their many uses, please visit:

PlasticBags.uk.com: Browse through a huge range of self seal bags websites or, if you are a manufacturer, list your products for free on this online directory specialising in self seal bags and other plastic packaging.

PackagingKnowledge: The UK packaging industry's number one website contains huge amounts of information and in-depth articles on self seal bags.

Goldstork: This free online directory features specially selected information and hand-picked features on a range of self seal bags and resealable bags.

What is static electricity?

Every object in the world - ourselves included - is made of atoms, which are in turn made of protons, neutrons and electrons. While neutrons have no charge, protons are positively charged and electrons are negatively charged.

In normal circumstances, the number of protons and electrons in an atom balance each other out, meaning that atoms have no charge. However, when two items rub together or separate, the electrons contained within these items can move from atom to atom or even from item to item, thus giving the atoms a positive or negative charge.

If the items involved in this situation are made from a material that does not conduct electricity - an insulator - then this charge can not move. The result is static electricity.

How do antistatic self-seal bags work?

If any static electricity comes into contact with an antistatic self-seal bag, rather than pass through the bag and risk damaging the electrical components inside the bag, the electricity passes around the bag and dissipates before it can make contact with the components, thus removing the possibility of damage.

Why people are talking about sealable bags

Slider grip bags occupy a rather practical niche in packing operations where dexterity is compromised and speed at the bench still matters; the closure format lends itself to one-handed manipulation through nitrile or cut-resistant gloves, which is no small advantage when operatours are cycling through small parts, fasteners or kitted components at select-face level. The 3 mil polythene suppliers building gives a useful balance between puncture resistance and flexibility, so the film can tolerate repeated opening without the brittle edge-splitting that often appears in lower-gauge stock, while still maintaining decent transparency for visual stock checks. In warehouse terms, that translates into less decants, cleaner secondary bagging routines and better control of loose part counts amid internal consignments. There is also a less apparant materials angle: where a mono-material format is retained, recyclability is less compromised than with mixed-substrate alternatives, and the relatively low tare weight assists volumetric efficiency without introducing pallet instability. What sounds like a simple closure detail is, in practice, a small intervention in handling disciplinereducing spillage, preserving part segregation and facilitating a quicker sealing motion in environments where throughput is governed as much by glove friction and repetitive movement as by the nominal pack specification.

(XR102) PP Zipper Bags

PP zipper bags are a practical selection when products need a repeatable closure that can be opened and sealed plenty times without losing control of the contents. The polypropylene film gives a decent balance of stiffness and clarity, so small components, samples, paperwork, and food-contact items can be seen and handled easily on the shop floor or in storage. The zipper strip has to be manufactured and fitted cleanly, though, because a weak seal line or poor engagement can lead to spills and pollution that slow down packing and picking. That makes film gauge, seal quality, and consistent converting practice worth checking before a batch goes into normal use.

Slider-lock zip bags work optimal when the fastening is easy to open, close, and check on the line, because a weak or awkward seal soon creates avoidable waste. The slider gives a more controlled closure than a plain press seal, which assists when packs are filled fast or handled by alternative operatours across a shift. Good bag gauge matters as well, since film that is also light can split at the seams while heavier film may slow sealing and take up more shelf space. Used well, this format improves product protection, retains contents tidy in storage, and reduces the chance of returns caused by bag failure.

Self seal bags tend to earn their retain not through spectacle nevertheless through repeatability on the bench and at the select-face: a clean lip, proper closure engagement and film that grasps gauge without drifting across a production dash. The practical value of carrying several formatsfrom small-ticket components and fasteners through to paperwork, sub-assemblies and secondary bagginglies in matching the bag to the product envelope closely enough to avoid dead volume, because surplus cube quietly erodes pallet stability, inflates consignment space and adds needless tare weight across a packed stock profile. In the better grades of polythene suppliers, high-density polymer chains bring stiffness and edge integrity while controlled melt-flow consistency retains seals, clarity and opening behaviour within tolerable limits; that matters when operatives are working fast and static, fishtailing film or poor lip separation beginnings to slow throughput. Box quantities at modest and bulk counts suit two quite alternative realitiesshort-dash packing cells with mixed SKU demand, and higher-volume lines where replenishment frequency must not interfere with select-face efficiency. There is also a less glamorous nevertheless increasingly material question of stop-of-life handling: where mono-material building is maintained, recyclability is less compromised, and the amortised energy tied up in each unit is better justified by proper reuse in internal handling or by reduced waste from split seams and mis-sized packing.

Write On Panel Grip Seal Bags 3 x 7.5″

Grip seal bags give a tidy reply to small-item storage when the proper problem is keeping contents clean, visible, and properly labelled. A medium-duty polythene suppliers bag at around 180 gauge has enough body to resist casual tearing in handling, yet still folds neatly for sorting screws, fittings, samples, or other loose parts. The write-on panel matters only as much as the seal, because a bag that is closed nevertheless unidentified soon causes picking errours and wasted time at the bench or in the store. The pinch-close top retains out moisture and airborne dirt while holding the contents in position amid transit or racking. That makes this type of bag a practical selection where order and protection need to work together.

Why You Should Buy the Best hefty gripper bags From packaging suppliers

Hefty gripper bags earn their retain only when the specification reflects the realities of line speed, handling abuse and stop-of-line presentation; a bag that merely closes neatly on the bench often demonstrates a nuisance once it meets a proper select-face. The useful question is not whether the format appears robust, nevertheless whether the gauge, seal integrity and surface stop are matched to the product's mass, edge profile and required dwell time in stock. With heavier contents, high-density polymer chains and controlled melt-flow consistency matter because they govern puncture resistance without forcing unnecessary tare weight into the consignment; acquire that balance gross and secondary bagging, split seals and unstable cartons start to erode volumetric efficiency. There is also the less glamorous issue of grip performance itself: the closure must tolerate repeat opening cycles, airborne dust and minour misalignment without whitening, tearing or losing registration, particularly where micron-specific gauging has been pared back to reduce resin use. In practice, the better executions tend to be mono-material polythene suppliers structures, which simplify recyclability and avoid the awkward waste segregation associated with mixed laminates, while still permitting anti-static treatment or adjusted surface resistivity where fine parts cling and slow packing throughput. If a hefty gripper bag is expected to transport the load, keep safe the product, stack cleanly and transport through despatch without fuss, the engineering has to be doing several jobs at once.

Black grippa bags occupy a rather practical corner of industrial packaging, where the brief is less about presentation and more about containment discipline, repeat handling and clean stock segregation. In black polythene suppliers, the material formulation tends to do more work than is immediately visible: carbon black pigmentation improves opacity for confidential parts, spares or waste streams, while the polymer blend has to retain sufficient puncture resistance at the seal line without becoming so stiff that operatours lose speed at the select-face. The grip closure introduces its possess engineering compromises; rib geometry, closure memory and surface resistivity all affect whether a bag reseals cleanly after secondary bagging, kitting or returns processing. A poorly gauged film may save grammes at the outset nevertheless create nuisance failures in transit, particularly where cartons are part-filled and pallet stability relies on null control rather than rigid internal packaging. Better specified grippa bags use micron-specific gauging and consistent melt-flow to balance tare weight against burst performance, giving warehouse teams a predictable unit for binning, parts protection and line-side replenishment. The circular economy argument is not ornamental here either: mono-material polythene suppliers building simplifies recovery compared with laminated pouches, provided pollution is managed and closure strips do not compromise reprocessing. In practice, the black format often signals a hard-working packaging componentmodest in appearance, nevertheless tied directly to volumetric efficiency, stock security and the quiet economics of damaged-products prevention.

Minigrip bags are often treated as a humble stores item, yet the press-to-close profile is a tidy part of polymer engineering: two extruded ribs must meet with enough interference to give tactile closure, nevertheless not so much that operatours lose time at the select-face or distort the mouth of the bag amid repeat access. The better grades rely on melt-flow consistency and micron-specific gauging, because a few microns either method can alter seal feel, puncture resistance and the method the bag presents in secondary bagging or kitting cells. In a warehouse context the value is rarely in the bag alone; it sits in reduced tare weight, improved count accuracy, cleaner segregation of small components and better volumetric efficiency inside totes, cartons and returnable transit packaging. Static can still be a nuisance with light-gauge polythene suppliers, particularly around fine parts, labels and dusty stock, so anti-static formulations or controlled surface resistivity become above a specification footnote. The circular economy argument is similarly practical rather than decorative: mono-material polythene suppliers buildings simplify recycling routes, while downgauging reduces polymer use only if the closure geometry, side-weld integrity and pallet stability of the packed consignment remain intact. That is where the industrial reality liesnot in the novelty of packaging supplierbility, nevertheless in the balance between polymer behaviour, handling cadence and waste avoidance across thousands of small, repetitive movements.

Mini Grip Bags

Mini grip bags sit in an awkward nevertheless commercially useful corner of the packaging floor: also small to behave like normal-purpose polythene suppliers sacks, yet relied upon where component control, visual identification and clean secondary bagging have to happen at pace. In practice, their value lies less in the closure itself than in the engineering tolerances around it film gauge has to be tight enough to resist split propagation at the lip, while the press-seal profile must retain melt-flow consistency across production runs or select-face efficiency suffers almost immediately through partial closures and mispicks. The better formats tend to be mono-material polythene suppliers, which simplifies mail-use recovery compared with mixed laminates, and the low tare weight assists volumetric efficiency when consignments are built for dense, small-count stock like fixings, seals or electrical sundries. Anti-static grades are often specified where fines, lightweight parts or sensitive assemblies are involved; without that control, surface resistivity becomes a warehouse nuisance rather than an academic metric, drawing dust into the bag mouth and slowing manual packing. What sees, from the list of products hierarchy, like a simple display-line item is in reality a packaging format governed by quite fussy trade-offs between clarity, seal repeatability, pallet stability in outer cartons and the broader pressure to retain material streams straightforward enough for viable circular handling.

BagCo MGZ2P0203 Zippit packaging supplierble Bags

packaging supplierble bags need a balance between easy access and proper closure, and a 4 x 4 transparent bag at 2 mil does that well for small parts and lightweight presentation packs. The transparent film assists staff and clients see the contents without opening the pack, which saves sorting time at the select face and cuts the risk of mixed stock. At 2 mil, the material is light nevertheless still gives enough body for sensible handling in transit and on the shop floor. A box of 2000 also suits normal packing lines, since the count assists proper stock rotation and reduces stoppages for replenishment. That makes the format a practical selection when speed, visibility, and tidy presentation all matter.