Sealline's waterproof Bulkhead Compression Dry Bag offers a quick and easy way to make maximum use of the limited space on paddling trips. It features an innovative compression system and the completely waterproof PurgeAir valve to ventilate trapped air, and is made from materials that are easy to stow - all of which makes it the best waterproof transport bag for kayak and boat hatches.
Radio Frequency (RF) Welding
Using high frequencies, two tissue parts are connected to each other at the molecular level. This robust, reliable and waterproof process is much better and more durable than sewn and glued seams. An RF seam is up to twice as strong as conventional seams that are only sewn and glued over. This results in an uncompromisingly protective and longer lasting seam.
Waterproof one-way valve releases air trapped in the dryer pocket twice as fast as the previously used valve and is both more durable and more reliable than waterproof/breathable fabric membranes. The small, lightweight valve is welded into the bag. Since it does not require stitching or masking, this valve is much more reliable in terms of waterproofing.