What is a dry bag? A dry bag is effectively a container that which seals watertight and commonly used to keep sensitive items and belongs safe and dry when either kayaking, canoeing, rafting, skiing and other extreme outdoor sports and activities such a snowboarding. Add a dry bag to your outdoor equipment list to protect electronic devices from being exposed to water, such as cameras, laptops, tablet computers and phones; to shielding your keys, wallet or purse. In addition, you can use a dry bag to protect items of clothing and sleeping bags from getting wet should you be camping. Carrying a rucksack full of damp and muddy clothing, then store your clean items in a dry bag to separate your gear.