Send bulky items with confidence in these exceptionally strong gusset envelopes, which combine good looks and strength Heavyweight 130g/m2 manilla with a subtle ribbed texture and distinctive sheen All items are made from EU Eco-label accredited paper - better for the environment. All gusset envelopes are peel and seal and feature Power-Tac adhesive for an exceptionally secure seal. A 25mm block bottom to the gusset maximises the available capacity.