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NEXTDry bags date all the way back to the Vietnam War—at the time, the United States government issued rubber-coated bags that were cemented at the seams. But Plastech, later acquired by Cascade Designs and called SealLine, was the first to weld its closure straps, which never pulled out and which provided a drier seal; to weld fail-free round bottoms in dry bags, which made the bags easier to load in a kayak hatch; and to eliminate square corners, which tended to become abraded and leak.
Sealed dry bag
Photo: Courtesy of SealLine
