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PU Polyurethane dry bags are OK I have several but prefer high quality SilNylon (Silicone impregnated ripstop nylon) which is generally lighter and lasts longer. It doesn't need to be the Sea-to-Summit Ultra or Ultra Nano or any of their other heavier lines, there are other manufacturers that make good SilNylon dry bags. eVent bags are less waterproof but effective in a backpack as well. I like small PU bags for kayaks not backpacking. Dry bags of all types and manufactures have eventually failed on me, obviously nothing lasts forever, my trips are hard on gear :-)
I agree PU is generally cheaper and doesn't last as long, but most PU coatings used today are better than they were many years ago. I'll be interested to see how these hold up. All my dry bags eventually fail or need patches, both expensive and cheap, light or heavy. Best to check before each trip and as you suggest avoid sharp or rough objects inside as well out. If in bottom of a boat with something critical like bedding (Down SB) I sometimes double bag. Backpack or extra nylon canvas bag in kayak/canoe can help to reduce wear of sand etc. from grinding on them.