The Arundel Medio Seat Bag is water resistant and extre durable. Arundel makes use of sonic welded seams and nylon fabric impregnated with thermoplastic polyurethane. Think frogman raft. The straps are also nylon and wider than usual, like seat belts in planes and cars. A wider strap means more Velcro area for better security. The materials cost more but in exchange, you have a seat bag that should last a good long time.

• 33 cubic in, 5 x 3¾ x 2 in
• Sonic welded seams
• Wide 1 ½ in nylon strap with extra velcro
• Fits an MTB tube or two 700c gravel tubes, plus gas, filler, etc.