Montbell Dry Shoulder Bag MA shoulder bag you can use with peace of mind even when the rain is really coming down. The outstandingly waterproof fabric is joined together by welded seams, preventing water penetration. The opening flap has a resin insert that helps eliminate spaces between the flap and the bag where water could penetrate. It is also easy to take items in and out. *Although this product has a high level of waterproofing, it is NOT meant to be used underwater.