The Watershed duffels that I own have held up fine so far but Watershed does recommend lubricating the closures periodically and include a small packet of 303 Protectant to use for that purpose. The duffels have a male fastex side-release type buckle at each end of the closure that meets with female side-release buckles sewn onto each side of the duffel near the bottom. This maintains the closure in a half-folded position and then two more straps, adjustable for length, go over the top of the closure to keep it half-folded down. If the closure failed I suppose this half-fold might retard some water entry into the duffel but it certainly wouldn't be waterproof. In order to be able to connect the side release buckles at the ends of the closure, it would be necessary to fold the top at least 270 degrees, which I doubt would even be possible. All four of the different sized Watershed duffels I own (Ocoee, Chattooga, Yukon, Colorado) close and fasten in the same way.