Abstract: A dry bag harness system for use with a roll top dry bag. The harness system allows for stitch free construction of a waterproof bag to provide use of compression straps around the perimeter of the bag. The webbing or strap is one continuous piece, and is free moving within the contained area. The containment system includes a patch that is sealed or welded to the bag to provide for a waterproof and airtight construction. The patch includes a passageway for the strap to allow the strap to slide within the patch while the strap is being tightened around the bag. The dry bag is constructed without any stitched areas and this arrangement allows the strap to apply even pressure to the bag when cinching the web type strap.