The Almsthre Compact Saddle Bag mounts under your saddle using a single adjustable strap that wraps around the saddle rails. The bag measures four and a quarter inches long by three inches wide by one and a half inches tall, providing 0.3 liters of capacity. That volume fits one spare tube, a compact multi-tool, tire levers, and a CO2 cartridge without creating bulk that hangs below your saddle rails or interferes with rear wheel clearance. This compact size works particularly well on mountain bikes with dropper posts where you need the saddle to drop completely without the bag hitting the rear tire.

The ripstop nylon construction resists tears from sharp tools or frame contact, and reinforced wear points at high-stress areas prevent premature failure where the mounting strap attaches and where the bag contacts the seatpost. A waterproof zipper seals the main compartment against rain and road spray. The high-visibility liner inside the bag makes it easy to locate small items like CO2 cartridge heads or valve cores when you open the bag during roadside repairs or in low light conditions.

The bag sits tight against the saddle rails without sagging or swaying when loaded. The mounting strap adjusts to fit different saddle rail configurations, including traditional round rails and carbon fiber rails with oval or rectangular profiles. The slim profile keeps the bag tucked under the saddle where it stays clear of your thighs during pedaling. At 45 grams, the bag adds minimal weight to your bike while carrying essential repair items. The compact footprint makes it a solid choice for riders who prioritize minimal weight and streamlined aesthetics over maximum storage capacity.