Resiliently protective, this Waterproof Dynamic 40L Backpack has been constructed from 1000D and 500D PVC for a premium finish and remarkable strength. An exceptional waterproof roll-top and heat sealed seamed construction keeps out moisture to safeguard the contents of its 40L main compartment against water damage. Perforations, on the bag's non-waterproof front pocket provide drainage, decreasing drying times while a hardwearing valve releases pressure. Locate your items with ease, using the bag's PVC window.