Poly Postal Packaging
Call 0844 8845346 today for the best prices
CO-EX Mailing Bags
Opaque Polythene Envelopes (100% Opaque)
White Mailing Bags
White Postal Bags
Heavy Duty & Extra Thick Mailers
100% Opaque (Black/White Co-Extruded LDPE) - Courier Bags
Ideal for mail order, courier services and in particular the legal profession where confidentiality is important. With standard grey or blue mailing bags, (unless they have been made at a minimum thickness like ours), you can see through them! If you need mailing bags which are 100% opaque, then you need these. Made from a three layer film, rather than the standard mono layer film used for standard grey and blue mailing bags, these are really tuff envelopes. With a unique grade of hot melt glue used for sealing the bags, once they are sealed, they are sealed!! Bags can be addressed and accept labels, stamps and biro. These bags are supplied plain, but we also stock some sizes with white write on panels. Over to the right you will see a list of the stock sizes available and the PiP catergory which each size falls in to
Prices are per box or per 1000 excl Vat and get cheaper when you buy more
For larger bulk orders please use our enquiry/quotation form to get the best price. If you would like to see a sample before you order a particular bag or range of bags, then we are happy to post them free of charge, just use the enquiry - sample request form on the contacts page.
Where you see the sizes listed on the right, the opening on the bag is the first dimension. For example, CXC5 which is listed as 170 x 235mm will have the opening on the bag on the 170mm dimension. 170mm being 17cm or 6.69 inches. If you would like a quotation for mailing bags to your own size, then please use the enquiry/quotation form giving us the details of your own design and we will let you know the costs
Delivery will be charged on orders totalling less than £150.00 nett @ £10.00
Vat is extra at the standard rate of 17.5%
Orders placed before 1pm will be delivered next day subject to
stock availability and payment
Product finder
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Our Products
- 2.1: Grey Mailing Bags - 100% Degradable
- 2.2: Grey Mail bags with warning notice
- 2.3: Black Mailing Bags - 100% Degradable
- 2.4: Metallic Blue Mailing Bags
- 2.5: Baby Blue Mailing Bags
- 2.6: Degradable & Re-usable Mailing Bags
- 2.7: Green Mailing Bags
Current page is 2.8: White Heavy Duty COEX Mailing Bags
- 2.9: Violet/Black Mailing Bags
- 2.10: Purple Mailing Bags
- 2.11: Pink Mailing Bags
- 2.12: Red Mailing Bags
- 2.13: Neon Green Mailing Bags
- 2.14: Orange Mailing Bags
- 2.15: Silver Polythene Mailing Bags
- 2.16: Clear Self Seal Mailing Bags
- 2.17: Coloured Metallic Foil Mailers
- 2.18: Documents Enclosed Envelopes
- 2.19: PP Bags | Cello Bags | Greetings Card Bags | Header Bags
- 2.20: Garment Bags
- 2.21: Hook Bags Clip Close Handle Bags
- 2.22: Jiffy Style Bags
- 2.23: Bubble Wrap
- 2.24: Postal Tubes
- 2.25: Degradable Carrier Bags
- 2.26: Carrier Bags
- 2.27: Coin Bags
- 2.28: Grip Seal Bags
- 2.29: Tissue Paper



