So I have a ton of dry bags, but they are all the kind that are rubberized on the outside, and most are pretty large. They are NOT gonna fit in the itty bitty NDK hatches! It's not just the size--even the smaller ones are hard to get in b/c they are sticky, not slidy, like the Sea to Summit bags. I'm assuming that the Sea to Summit ones are not as 100% dry as my bags are, but the hatches seem very tight on my boat (rolled and surfed for 2 days and no water in there at ALL). so they should be OK. How do I figure out from the sizes given on most websites if they will fit? 5L, 10L? Sometimes they give size in inches, but it's not clear if that's diameter when filled or just width when laid flat. I'm annoyed that I have to order MORE STUFF, but looks like I do. <sigh> I just have to make sure I get the right sizes. I will make some of my smaller bags do--I will be able to stuff them in if it's just clothes inside. Anything less malleable and it's impossible. Planning a 3 night camping trip in April, so need to sort it out by then. Will have to re-do my whole packing procedure, so will need to practice, I think!