My wife and I Bought the 70L and used it on a 4 day trip into the BWCA. It holds a ton of stuff!. The thing i liked most about it was the straps that go over the top are extra long so we strapped two full size camping chairs and two air mattresses on top of the pack after it was sealed up. Sure made for an easy portage that was 3/4 of a mile long with 4" mud puddles,down trees, hills and slippery rocks! I love SealLine!