A dry bag is a type of flexible container which seals in a watertight manner. Dry bags are often used in kayaking, canoeing, rafting, canyoning,[1] and other outdoor activities in which 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. They are also used to prevent sleeping bags and spare clothing from getting wet, as in a camping context.
Construction
They are often a construction of plastic film, plastic-coated fabric, or waterproof fabric ( Nylon, Vinyl, TPU, PVC and Tarpaulin [2])which is formed to create an impermeable, waterproof bag. Construction techniques include welding,(RF or Radio Frequency Welding[2]) sewing (a seam-tape is used to seal over any needle holes) and gluing.
Roll Top Enclosure
Most dry bags achieve their waterproof status using a simple roll top closure system or Waterproof zip.
Most commonly the opening to the dry bag is rolled down three times to create the watertight seal[2] and then this is clipped in place, another way to waterproof a dry bag is to use a waterproof zip.[2]
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.
