A dry bag is a type of flexible container which seals in a watertight manner. Dry bags are often used in kayaking, canoeing, rafting, and other outdoor activities where sensitive items would otherwise get wet as well as extreme sports such as skiing and snowboarding. Dry bags are used to protect electronics from water. As well, they are used to prevent sleeping bags and spare clothing from getting wet, as in a camping context, wet sleeping bags or spare clothing could post a risk to a camper's safety, due to the poor insulative qualities of wet clothing or sleeping bags.
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Construction
They are often a construction of plastic film, plastic-coated fabric or waterproofed fabric which is formed to create an impermeable, water-ingress protected bag. When using a dry bag, it is vital to ensure the roll top closure is folded at least three times, to create a watertight seal. Construction techniques include welding, sewing (where a seam-tape is used to seal over any needle-holes) and gluing.
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Sizes
A large range of sizes are available, ranging from small bags large enough for a camera or smartphone to mid-size bags large enough for a sleeping bag, to large bags big enough for several sleeping bags and a folded tent.
Source of the article : Wikipedia
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