Join Us. Home to many leading brands in the Eco-friendly Postal Packaging market, with Enviroflute being the latest - 'The Worlds Most Environmental Friendly Padded Bag', you don’t have to look elsewhere. Peak is widely recognized as the UK’s No.1 supplier of Envelopes and associated Postal Packaging Solution, with an extensive product range & flexible production capabilities including products like Gussets, Allboards, Metallic Envelopes, and unique production capabilities like UV printing (printing on to any coated paper/board substrates), Flexo & Litho Print, to very short run bespoke size/material and finishes including Foiling, Matt Lamination, Perforation, & Folding to name just a few of the finishing capabilities. If that sounds good to you—then we hope you’ll join us.