The ortlieb ps10 drybag liner is the perfect fit liner for any backpack or bag this durable waterproof liner is made of coated nylon fabric with a roll closure stiffener and buckle that is designed as a rucksack or pack liner this ortlieb drybag liner is an ideal supplement for non waterproof duffles backpacks or trekking packs designed with the best materials it will keep your gear dry and clean at all times the square shaped base made of abrasion resistant p