HURRICANE BACKPACK TAIL BAG 30L BLACK100% waterproof, all seams are electronically heat welded Made from durable UV Coated 24oz Tarpaulin PVC Water tight roll closure with quick release buckles Bag can seal in 2 different closure methods, over the top or down the sides Extra large buckle ensures roll stays closed in all environments One way waterproof purge valve makes for compression easy Reflective webbing and external bungee storage system Inner sleeve to hold most folders, notebooks,