The Sea to Summit Lightweight Dry Sack Large 13L is a less expensive and less bulky alternative to traditional dry bags. You can squash these into spots ordinary heavy dry bags won't go. Fits into little corners of a sea kayak or light enough to take backpacking or adventure traveling. Suitable to keep contents dry in any wet situation where the bag is not submerged.Proper Use: Any roll-top dry sack must be closed properly to ensure water can't get in. Begin by folding the Hypalon strip down first and be sure to have at least three rolls before closing the buckleAvoid contact with sharp objects or subjecting the sack to high abrasion, as this could compromise the waterproof fabricLike all manufacturers of roll-top, fabric dry sacks, Sea to Summit recommends that sensitive electronic devices be 'double bagged' (i.e. putting electronics inside one dry sack then placing this inside a second dry sa