The Arundel Dual is built around the idea that one spare tube is good, but two is smarter. The bag earns its name by holding two 700c tubes, two CO2 cartridges, an inflator, and tire levers without turning into a thigh-rubbing burden. That second tube means you can keep riding instead of calling for a pickup when misfortune strikes twice. The 35 cubic inches of capacity splits the difference between minimalist bags that barely fit one tube and oversized designs that swing against your legs.

Arundel keeps the attachment simple with a single Velcro strap that loops through your saddle rails and cinches tight. The strap is sewn double-thick so it holds its shape and stays put once you tighten it down. There's no second strap wrapping around your seatpost, which means you avoid the finish wear and rubbed paint that comes with typical two-strap systems. A leather patch sits between the bag and your seatpost clamp hardware, protecting the bag fabric from punctures and friction damage where it contacts the bolt heads. This detail extends the bag's lifespan considerably.

The main zipper runs along the center of the bag's length, opening wide enough to let you pack and access your gear without fighting a narrow opening. The bag measures 5 inches by 3 inches by 2 inches, sized to tuck under the saddle rails without interfering with your pedaling motion or hitting the backs of your thighs. If you run wider road tires up to 32mm or a mountain bike setup, the bag handles one larger tube along with your CO2 supplies and tools without issue. The construction uses ballistic nylon fabric that resists abrasion and a zipper pull that's easy to grab when wearing full-finger gloves.