Pack covers are useful, so long as they''re light?otherwise you''ll hem and haw over whether to bring it, and then when it rains, Murphy''s Law guarantees you''ll have left it behind. The Granite Gear''s Cloud Cover Pack Fly weighs less than four ounces, but keeps your pack bone-dry, so no compromises are needed.

30D Sil (silicone impregnated) Cordura nylon ripstop weighs little but is durable and totally waterproof
Fits most packs up to 4000 cubic inches
Item #GRG0060

MaterialSil-Nylon Cordura (30D)
Pack Size[x-small] 29 - 41L (1800 - 2500cu in), [small] 41 - 54L (2500 - 3300cu in), [medium] 54 - 65L (3300 - 4000cu in)
Claimed Weight(XS) 3 oz, (S) 3.4 oz, (M) 3.9 oz
Recommended Usekeeping your pack dry