This liner is perfect for waterproofing your bag with the option of a better seal with the roll top. I would have loved another 5-6 inches of material at the top the match an average roll top pack height, so you can more easily grab both pack and liner material while packing. But it’s not a big deal. If your the type that stuffs everything needing water protection at the bottom of your bag and rather not pack with individual bags then this liner is perfect. It does eventually run a bit short if your attempting to put everything in it, but I have cookware and some other stuff in separate water proof bags I put at the top of pack anyways. If the word got out more about these liners I’m sure a lot more people would use them and ditch other options without a roll top feature. Like i said 5-6 more inches and this thing would be prime. Maybe we will see more options in the future.