I ' ve just realized the PC in PC Authority doesn ' t just stand for Personal Computer <| sep |> If you go by what you hear on the radio and tv , everyone but the Cowboys . <| sep |> I agree with uMcf 82 that dry sacks inside a pack liner are usually redundancy . Next time you get a good storm at home , throw your pack , with liner and stuff inside , outside and see what happens . If the gear inside the pack liner stays dry , then you ' re fine . Furthermore , I would ask what really needs to stay dry . For example , I used to always worry about my food bag until it got drenched one night while hanging on a bear pole . In the morning , I discovered that all the contents were perfectly fine thanks in large part to the fact that I repackaged stuff into quartsized freezer Ziplocs , so now I never worry about waterproofing my food bag . YMMV .