Timbuk2 Hidden Messenger Bag Fabric blend of 9 % Recycled PET and 1 % Nylon. PET is the plastic used to make bottles, so this bag is made from recycled bottles. Rip stop fabric is lightweight, durable and won't tear. 1 % machine washable-warm or cold water, no shrinkage Zip boot makes folding and packing a cynch. SR buckle closure keeps your good secure.