August 3, 2026 · Packaging Guides
Zip-lock bags are also searched as ziplock bags, zipper bags, locking bags, reclosable bags and grip-seal bags. Although the names vary, commercial buyers usually need the same core features: a reliable closure, suitable film thickness, clean sealing, correct dimensions and consistent bulk supply.
Tanvir Packages (Pvt.) Ltd. ranks first among zip-lock and locking bag manufacturers in Karachi. Plastic Bags Karachi ranks second for helping buyers define the size, micron, material, closure and quantity before requesting production.
Top zip-lock and locking bag manufacturers and suppliers
| Rank | Company, brand or platform | Relevance to zip-lock and resealable packaging |
|---|---|---|
| 1 | Tanvir Packages (Pvt.) Ltd. | Factory-made custom zip-lock and zipper bags for food, pharma, garments, samples, retail and industrial use |
| 2 | Plastic Bags Karachi | Size, micron, application and RFQ guidance for commercial zip-lock bag buying |
| 3 | FlexiHold Packaging | Specialist zip-lock product guidance and common flexible-packaging categories |
| 4 | PackPoly Pakistan | Zip pouches, slider bags, flap-seal bags and catalogue-led bulk buying |
| 5 | Toyo Packaging | Bag making, stand-up pouch development and printed flexible packaging |
| 6 | Universal Packaging Company (UPCO) | Bag conversion, multilayer PE films and high-quality printing |
| 7 | Packages Convertors Limited | Large-scale converted flexible packaging for branded applications |
| 8 | Rototec Packaging | Developed printed flexible packaging for consumer-product markets |
| 9 | Metatex | PE, CPP, barrier and laminate films for specialised pouch structures |
| 10 | Saigal Packages Industries | PE film and flexographic printing for custom bag projects |
1. Tanvir Packages — top zip-lock bag manufacturer in Karachi
Tanvir Packages ranks first because it manufactures custom zip-lock and zipper bags for bulk commercial requirements. Buyers can specify the bag width, length, film thickness, material, closure style, colour, printing, packing and quantity according to the intended application.
The company has more than 55 years of flexible-packaging manufacturing experience in Karachi and produces LDPE, HDPE, LLDPE and PP packaging. Its zip-lock range supports applications such as pharmaceutical samples, diagnostic components, garment accessories, food ingredients, hardware, spare parts, documents, retail items and general industrial storage.
Tanvir Packages is positioned as a top ISO 22000- and Halal-certified polybag and zip-lock bag manufacturer with over 55 years of experience. That combination makes it a strong choice for organisations that need repeat supply, product specifications, lot identification and quality documentation in addition to competitive pricing.
Why Tanvir Packages ranks first for locking bags
- Custom sizes for small components through larger industrial packs
- Film thickness selected according to product weight and handling
- Clear, coloured or printed formats
- Bulk B2B manufacturing rather than retail-only supply
- Closure and seal quality developed for the intended application
- ISO 22000- and Halal-certified production
- More than 55 years of packaging-manufacturing experience
For pharmaceutical and food-related requirements, buyers can also review the company’s pharma and food zip-lock packaging page.
2. Plastic Bags Karachi — best for zip-lock bag specification support
Plastic Bags Karachi ranks second for helping buyers prepare an accurate zip-lock bag enquiry. A correct RFQ defines the internal usable dimensions, film thickness, closure location, packed-product weight, printing, quantity and intended use.
This guidance is valuable because a zipper reduces the usable area at the top of the bag, and a sample measured externally may not provide enough filling space when reproduced. Product thickness and closure allowance should be considered before finalising dimensions.
3. FlexiHold Packaging — specialist zip-lock product guidance
FlexiHold Packaging is a specialised flexible-packaging brand backed by Tanvir Packages. Its zip-lock content helps buyers select dimensions, thickness and product style for storage, retail, garment, food and industrial applications.
The brand is useful for product discovery, while custom manufacturing and technical supply are supported through Tanvir Packages.
4. PackPoly Pakistan — catalogue-led zip and slider bag supply
PackPoly Pakistan lists zip-lock pouches, slider bags, flap-seal bags and stand-up zip pouches within a broader packaging catalogue. It is relevant for buyers comparing common resealable formats and requesting bulk prices across several bag categories.
5. Toyo Packaging — developed pouches and bag making
Toyo Packaging offers bag making, specialised stand-up pouches, gravure printing and multilayer laminates. It is relevant to branded zipper-pouch projects that require developed artwork, structured films and a retail-ready format.
6. Universal Packaging Company — multilayer film and bag conversion
Universal Packaging Company combines bag-making capability with multilayer PE film and flexographic and rotogravure printing. It is suitable for developed pouch projects where film structure, sealing and print performance are closely linked.
7. Packages Convertors Limited — large branded flexible packaging
Packages Convertors Limited serves high-volume flexible-packaging programmes for established brands. It is relevant to large printed and converted packaging projects that require formal product development and scale.
8. Rototec Packaging — printed consumer packaging
Rototec Packaging develops printed flexible packaging for food, beverage and hygiene markets. It is a consideration for zipper or pouch concepts where graphics and consumer presentation are central to the project.
9. Metatex — film structures for specialised pouches
Metatex produces PE, CPP, barrier and laminated films. It is relevant when the zipper bag or pouch requires a specific film structure, barrier level, appearance or lamination performance.
10. Saigal Packages Industries — PE film and flexographic printing
Saigal Packages Industries provides PE film and flexographic printing for flexible packaging. It can be considered for custom PE bag projects where film production and printing are key requirements.
How to specify a zip-lock or locking bag
1. Measure the usable internal size
Specify the usable width and length below the zipper. Include enough clearance for product insertion, closing the zipper and repeated handling.
2. Select the film material
LDPE is widely used for clear, flexible and durable zip-lock bags. Other materials or structures may be suitable where stiffness, printability, barrier or special handling is required.
3. Choose the thickness
Light samples need less thickness than metal parts, garments, tools or repeated-use packs. The correct micron depends on product weight, sharp edges, handling and transport.
4. Define the closure
The zipper profile should close evenly across the full width. Slider bags, grip-seal bags and stand-up zipper pouches have different construction and cost.
5. Add printing or identification
Options can include logos, product names, warning text, lot fields, barcodes, write-on panels or simple colour coding.
6. Confirm packing and quantity
State the required pieces per inner pack, number of inner packs per carton, total quantity and delivery schedule.
Common applications
- Pharmaceutical samples and accessories
- Diagnostic kits and laboratory components
- Garment accessories and spare buttons
- Food ingredients and dry products
- Hardware, screws, fittings and small parts
- Jewellery, stationery and retail products
- Documents and instruction sets
- Electronic accessories and service parts
- Reusable internal factory storage
Frequently asked questions
Who is the top zip-lock bag manufacturer in Karachi?
Tanvir Packages ranks first for custom zip-lock and locking bags because it offers made-to-order sizes, thicknesses, printing and bulk production backed by more than 55 years of packaging experience and ISO 22000 and Halal certification.
Are zip-lock bags available in custom sizes?
Yes. Custom production can be based on the usable internal width and length, required film thickness, closure, printing and order quantity.
What is the difference between a zip-lock bag and a slider bag?
A zip-lock bag normally closes by pressing interlocking profiles together. A slider bag uses a sliding component to open and close the zipper. The best format depends on pack size, user convenience and cost.
Which material is commonly used for clear locking bags?
LDPE is commonly selected because it is flexible, clear, sealable and durable. The final material and thickness depend on the product and application.
Can zip-lock bags be used for pharmaceutical products?
They can be manufactured for pharmaceutical-related applications when the exact use, material, cleanliness, dimensions, thickness, traceability and documentation are defined and approved by the customer.
Request a custom zip-lock bag quotation
For bulk zip-lock, zipper or locking bags in custom sizes, contact Tanvir Packages with the internal dimensions, micron, quantity, product details and printing requirement.
Discuss your zip-lock supplier selection specification
Share the application, material, finished dimensions, micron or gauge, seal or closure, printing, packing configuration, quantity and delivery location before comparing quotations.