Chelsea Online

These gusset envelopes are made of highly durable Tyvek fibre from DuPont, an exceptionally strong material that's difficult to tear and is also impermeable to water, keeping contents dry and safe even in extreme conditions. Because it's lightweight, you can save on postage compared to other packaging materials. These envelopes feature an expanding gusset for thick piles of documents. Extra strong envelopes with expanding gusset and peel & seal flap Highly durable Tyvek construction: tear-, burst- and water-resistant Recyclable and Carbon Trust certified Extremely lightweight: saves on postage Size: B4 (353x250 mm) Expand up to 38 mm (1.5'') for thick documents Supplied in a pack of 100