The SealLine EcoSee clear 5, and 10 Liter Bag with welded bottom, sides, and closure is the real deal, the kind with heavy, long lasting boat grade polished vinyl, and very easy to see all the contents, and rolls and secures well at the top, to make it watertight, if it were to become submersed; and it has a quick-side release buckle and D-Ring to anchor or tie it off to something if rafting or boating.The 5 liter size is rally for personal use, and the 10 liter for larger items you don't want lost or ruined due to getting wet/dunked/or having to chase down a river. This vinyl is not the sissy stuff you see used as tablecloths, this is more along the lines of what you see better quality clear windows being made from.Mind you, I would not recommend abusing it on purpose, but I don't think you will find too many reasons to be gentle with it, when securing what you want to carry in the 5 liter size pouch; such as a camera, phone, license, etc. etc. and the 10 liter for clothing items or so on and so on.I also would not recommend it being left in Direct sunlight anymore then is needed, as I suspect like most vinyl window material out there, the high UV will begin to yellow it over time; a day here a week there? I don't foresee any real problems developing over many years of satisfied use.