The Mystery Ranch Pack Fly Rain Cover keeps your pack and contents dry in super soggy conditions. The Pack Fly rain cover features a built-in pocket for easy stowage, elastic edges for secure fit, and a G-hook fastener. The Pack Fly has a compact and lightweight design, and is made of 70D nylon material.FeaturesBuilt-in pocket for easy stowageCompact and lightweight design Elastic edgesG-hook fastenerSmall: 1525 - 2746 cu-in (25L - 45L)Medium: 2746 - 4272 cu-in (45L - 70L)Large: 4272 - 6407 cu-in (70L - 105L)