Minigrip bags
What are minigrip bags?
Minigrip bags are also known as mini grip bags, self-seal bags, grip seal bags or grippa bags. They are polythene bags that ranging in size from 1.5" x 2.5" up to 15" x 20", which means they are perfect for storing a variety of products of all shapes and sizes. Whatever they are used for, minigrip bags keep their contents dry and free from dust and dirt, courtesy of a simple grip seal running along the top of the bag. Minigrip bags can be plain or labelled, with heavy duty, coloured or black minigrip bags, specimen bags, antistatic bags and many other types available.
Sealing & re-sealing bags
Resealable polythene bags open and close with a plastic seal that can be repeatedly sealed and opened, allowing the bag to be used more than once.
Self-seal bags are polythene bags featuring an integral seal that allows the bag to be closed without the use of any external object, such as an adhesive, tape or a bag tie, and without the plastic having to be sealed on bonded together using a heat sealer.
All resealable bags, such as minigrip bags, can be described as self-seal bags, as they do not require anything else to close them. However, not all self-seal bags can be described as resealable bags as some of them, such as the popular mailing bags, feature a seal that can only be used once. Once a mailing bag’s seal is opened, the bag cannot be used again.
Ways to seal a polythene bag
There are four main ways to seal a polythene bag. These are presented below, with examples to illustrate the sealing method:
1. Seal with bag clips or ties
You can seal a polythene bag by pulling together the two sides of the bag’s open end and then fastening with a plastic bag clip or tie. This is a particularly popular method for sealing food bags, either to store food in the fridge or freezer, or to tie up sandwiches etc. for packed lunches.
To seal bags with a plastic clip, place the two sides of the bag flat together, place them in the jaws of the clip and close it around them. To seal with a bag tie, scrunch the open end of the bag into a tight bunch, wrap the bag tie around it and tie up tight.
2. Seal with an adhesive strip
Another method for sealing plastic bags is with an adhesive strip. This method of sealing is used most widely in the manufacturing of mailing bags, as the bag can only be sealed once using this method, in the same way as standard paper envelopes, which means that any tampering with the bag’s seal would be obvious to the recipient of the mail.
To seal a mailing bag, place your items inside the bag, peel off the thin cover from the integral adhesive strip located on the mailing bag’s ‘tongue’, fold this flap over and press down to seal.
3. Seal with an integral reusable seal
Probably the easiest method of sealing a polythene bag is via an integral sealing device, such as a grip seal or a ziplock. Designed for ease of use, these sorts of bags - including grip seal, minigrip, slidergrip ziplock, ziplite and zipper bags - provide a simple method of opening and closing and can be used time and time again.
To close a grip seal bag, place one end of the seal between your forefinger and thumb and gently squeeze the bag from one end of the seal to the other. To open, simply give the two sides of the bag a gentle tug. To open or close a ziplock bag, just slide the zip all the way across to the correct end of the bag.
4. Bond/fuse polythene together with a heat sealer
The final and arguably the most professional way of sealing a plastic bag is to bond the polythene together by melting it. The best way to carry out this method of sealing is through a professional heat sealer. Just take the open sides of the bag, lay them together flat in the jaws of the heat sealer and press it down for a few seconds. Open the sealer and the bag will be sealed shut.
When used with layflat tubing - a long thin roll of polythene tubing - heat sealing is great for creating your own bespoke bags. Just place the item inside the layflat tubing and then seal one or both ends of the bag for your own made-to-measure polythene bag.
Antistatic self-seal bags
Antistatic self-seal bags are a specialist bag designed to store electrical components that require protection from the potential damage caused by static electricity.
They are also known as conductive bags, as the bag itself is a conductor. This does not mean that it collects tickets on buses or leads a miniature plastic bag orchestra, but that it conducts electricity, thus keeping it away from the contents of the bag.
Where can I buy sealing and re-sealing bags?
Manufacturers and suppliers of sealing and re-sealing bags include:
Self-Seal-Bags
Self-seal-bags.co.uk is a division of Polybags specialising in self-seal bags.Polybags Ltd has been providing customers with quality self-sealing packaging at competitive prices for over half a century.
www.self-seal-bags.co.uk
Discount Self Seal Bags
Free website helping you find everything you need from self sealing bags. Information, compare products, prices and online-stores stocking self-seal bags, clip-close bags, MiniGrip bags (aka Grippa bags) and all other types of resealable bags.
www.discountselfsealbags.co.uk
Heat Sealers Direct
Website providing you with the best suppliers of discount manual, impulse and foot operated heat sealers.
www.heatsealersdirect.co.uk
Resealable-Bags
Resealable-bags.co.uk markets a full line of reclosable packaging solutions preferred and used by many retailers, wholesalers and manufacturers alike due to their high quality and reliability. Our innovative products offer great solutions for storage, protection and advertising.
www.resealable-bags.co.uk
Antistatic-Bags
Ever wondered what antistatic bags are, how it is made, what it is used used for and where to buy antistatic bags at low prices? Find answers to all these questions about antistatic bags and static shielding bags at Antistatic-Bags.co.uk
www.antistatic-bags.co.uk
Self Seal Bags
SelfSealBags.org.uk offers custom self-sealing bags manufactured from high quality polythene film to accommodate your specific sizes or even anti-static needs. You may also or printed self-seal bags.
www.selfsealbags.org.uk
Zip Lock Bags
Great prices and discounts on mini-grip bags, self-seal bags and ziplock bags. Everything you need to know to help you choose the best type of polythene self-sealing bags to suit your packaging needs.
www.ziplockbags.co.uk
Things you may not know about Minigrip bags
Mini grip bags sit in an awkward nevertheless revealing corner of the polythene suppliers market: small enough to be handled in secondary bagging operations, yet exacting enough to expose all disadvantage in gauge control, seal integrity and opening performance. The better grades are manufactured with a transparent view to micron-specific consistency; that matters on the warehouse floor, where select-face efficiency can be lost to bags that cling, split or waste a clean reseal. A manufactured-to-measure line is not merely a matter of cutting film to size; it involves matching material formulation, neck stop and tare weight to the consignment's practical requirements, so that volumetric efficiency remains respectable and pallet stability is not compromised by awkward, below-used stock. When specified as mono-material polythene suppliers, such packaging also assists straightforward recycling pathways, avoiding the more troublesome mixed-polymer format and helping to retain feedstock in circulation rather than in waste streams.
A grippa bag lives or dies by its shear behaviour below an awkward, top-heavy optical load; a long zoom places a surprising overturning moment into a soft assist, particularly when perched on a car door skin or the narrow rail of a conceal. The better examples are not merely sacks of loose occupy, nevertheless controlled-compliance platforms: tightly woven outer cloth for abrasion resistance, a grippy lower face with enough surface friction to resist creep on painted metal or timber, and a occupy medium that settles without becoming dead or lumpy after repeated compression. Micron-specific gauging matters even in something this apparently simple, since above-thin inner polythene suppliers liners can split at the stitched corners, while excessive material mass adds tare weight and reduces the very portability that makes the format useful in the field. There is also a quiet logistical discipline behind it; flat-pack volumetric efficiency, sensible secondary bagging and consistent stock presentation all affect whether the item arrives with its occupy evenly distributed rather than compacted into one stop of the consignment. From a circular-economy standpoint, mono-material recyclability is difficult once coated textiles, thread, liners and granular filler are married together, so longevity becomes the more honest sustainability argument: robust seams, stable melt-flow consistency in any polymer components, and a shell that shrugs off damp grit will amortise the energy embedded in the product above plenty seasons of use.
Re-Sealable Clear Minigrip Bag, 75 x 85mm (Pack of 1000)
A minigrip bag earns its retain not through novelty, nevertheless through repeatable handling on the bench, at the select-face and in secondary bagging where closure integrity is tested dozens of times before a consignment ever leaves the building. The interlocking rib profile has to be formed with tight micron-specific gauging across the film web; if the seal geometry wanders, closure effort rises, pollution lodges in the track and the pack stops to behave like a proper reclosable format. In practice, the better buildings use low-gauge polythene suppliers with controlled melt-flow consistency, so the film remains supple enough for fast thumb-pressure sealing while retaining sufficient puncture resistance for small parts, powders or documents with awkward edges. The write-on panel is hardly a trivial add-on eitherit reduces stock ambiguity, assists batch segregation and mitigates the quiet inefficiency of unidentified loose units circulating through cupboards, freezers or products-in shelves. From a logistics standpoint, the format carries small tare weight, nests flat for sound volumetric efficiency and improves pallet stability when used as an inner pack because trapped air can be managed rather than tolerated. There is also a circular economy argument, provided the specification is disciplined: a mono-material polythene suppliers bag without mixed laminates or unnecessary fittings is simpler to recover in stream, and its comparatively modest material burden can sit reasonably well against the amortised energy cost of storing and protecting small-value items that would otherwise be misplaced, re-picked or discarded.
Mini Grip Bags Variations
Mini grip bag formats sit in a fascinating corner of transit packaging because their value is rarely in spectacle; it lies in control. In practice, the closure geometry has to do above merely shut a small polythene suppliers pouch it must maintain repeatable interlock integrity across fine-gauge film, tolerate frequent opening amid select operations, and do so without compromising seal line strength at the shoulders. That matters on the warehouse floor, where select-face efficiency is often dictated by how fast small parts, fixings or sample components can be identified, decanted and returned to stock without secondary bagging becoming a nuisance. A well-converted bag with consistent melt-flow behaviour and tight micron-specific gauging carries less tare weight through a consignment while preserving pallet stability upstream, particularly when thousands of units are aggregated into outers. There is also a less glamorous, though increasingly material, circular-economy question: mono-material polythene suppliers building facilitates cleaner recovery streams than mixed-format packs with paper inserts or rigid closures, provided the film specification is kept disciplined and unnecessary lamination is avoided. In short, the seemingly modest mini grip bag is less a generic pouch than a part of versatile packaging engineering balancing surface slip, closure memory and volumetric efficiency in a format that has to work first time, all time, below normal industrial handling.
A grippa bag sits in that useful middle ground between a flimsy disposable sleeve and a more engineered returnable pack; the value is not merely the press-to-close profile, nevertheless the method the interlocking rib can be specified against film gauge, seal integrity and repeat-open performance. In practice, that matters on the packing bench. Fine components, powders, fasteners and cut parts all behave differently once introduced to a polythene suppliers pouch, and the closure has to mitigate ingress, product migration and casual pollution without slowing select-face efficiency. The better formats rely on consistent melt-flow amid extrusion, which retains wall thickness even across the web and avoids weak corners that split below secondary bagging or pallet vibration. There is a logistical dividend as well: low tare weight maintains volumetric efficiency across a consignment, while transparency reduces handling errours in stock control and kitting lines. Where the specification is kept mono-material, recyclability becomes far less theoretical than it is with mixed-format packaging; that, attached with re-use above several opening cycles, shifts the discussion from simple unit cost to amortised energy and material yield across the life of the pack.
Minigrip Bag 55 (1000 Pack) GL-02
At 55 x 75mm, the minigrip bag sits in that rather useful type of small-format polythene suppliers packaging that tends to be underestimated until a select operation beginnings losing time to loose stock. In practice, the value is less about mere containment and more about controlled presentation: a transparent film with consistent gauge enables fast visual confirmation at the select-face, while the interlocking rib closure provides repeat access without resorting to secondary bagging or tape. For light components, sample ingredients, fixings or bench consumables, that matters; it mitigates part-count drift, reduces handling pollution and retains mixed consignments legible without adding disproportionate tare weight. The material itself requirements a sensible balance of stiffness and flexibilityenough body to resist splitting at the corners, enough compliance for proper seal engagement across repeated openingsand where melt-flow consistency is properly managed, the closure profile remains predictable rather than fiddly. There is a wider packaging logic to it as well: compact dimensions improve volumetric efficiency in tote packing, transparent mono-material building simplifies waste segregation after use, and the modest material mass means the amortised energy tied up in each unit remains relatively low when compared with heavier, multi-substrate alternatives.
Research & Resources
For further detailed information about sealing and re-sealing bags, right through their life-cycle from production to recycling, including details of the variety of re-sealable bags available, please visit:
Plastic Bags
Plastic packaging directory where businesses can add their own packaging product listings for free. Find a whole host of useful websites on sealing and re-sealing bags.
www.plasticbags.uk.com
Packaging Knowledge
This excellent online resource contains in-depth news and information on the plastic packaging industry. Read facts, stats and articles about packaging, including re-sealable bags.
www.packagingknowledge.com
Goldstork
Interesting online directory containing useful "best of the web" links to interesting and unusual websites, categorised to help your search. Goldstork also offers selected hand-picked websites specialising in sealing and re-sealing bags.
www.goldstork.com
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.
