Mailing bags

Mailing bags are the e-commerce workhorse: opaque co-extruded LDPE (typically a grey outer over a black inner for privacy) with a permanent self-seal strip, often a tear strip for opening, and sometimes a second seal strip for returns. Gauges run 50–70 µm; sizes follow parcel formats.

The category has moved decisively to recycled content — 30%+ is now the market's baseline claim, and at that level the importer's UK Plastic Packaging Tax liability disappears, evidenced by batch declaration. Specification points: dimensions, gauge, co-ex construction, seal type (permanent hot-melt for tamper evidence), print for branding, and returns feature. Classified HS 3923.21. Volume buyers are fulfilment operations, marketplaces and packaging distributors; printed runs consolidate well into mixed containers with other bag formats.