SealLine's Zip Duffel Bag is totally waterproof, which means you can submerge this duffel underwater and your gear and clothes will remain dry. Crazy, eh? The Zip Duffel's RF-welded seams and reinforced vinyl create a weather-proof barrier, so you won't have to worry about your stuff getting soaked on your adventure travels. Choose the 40-liter duffel for day trips, or the 75-liter for longer excursions.