Durable A4 Document Folio with Elastic Closure

32 × 23 × 5 cm external dimensions; 480 g weight. Contains 12 fixed-position, open-top expandable envelopes constructed from 350 gsm coated board with rounded corners and reinforced fold lines. Each envelope accepts A4 sheets vertically or passports horizontally, with internal depth supporting stacked documents up to 20 mm thick. Elastic closure spans full perimeter, tension-tested for 5,000+ cycles without degradation. Material choice prioritises UK environmental conditions: surface coating resists humidity-induced warping common in UK basements or bathrooms, while stiffness prevents sagging when filled — unlike cheaper polypropylene alternatives that buckle under weight. Stitching uses UV-stabilised thread to maintain integrity under indoor light exposure. Used widely across UK contexts: housing associations supply it to tenants for tenancy files; schools recommend it for student portfolios; solicitors suggest it for clients compiling probate evidence — validating its role as a trusted analog infrastructure tool.