Quality material: The backpack rain cover keeps the backpack dry and free from dust thanks to robust and waterproof nylon. APPLICABILITY: The backpack rain cover is ideal for outdoor activities. Travel. cycling and climbing. SIZE ADJUSTABLESuitable for almost all backpacks because of the elastic band. 100% WATERPROOF : 3000 mm water column. protects backpack and contents from rain. FUNCTION: The inner coating of the backpack rain cover effectively blocks rain. sun and dust.