The Almsthre Signature Bar Bag uses a hard shell construction that maintains its cylindrical shape whether you pack it full or leave it half empty. This rigid structure lets you grab items one-handed without the bag collapsing when you unzip it during a ride. The shell measures seven and a half inches long by four and a half inches in diameter, providing two liters of capacity. That volume fits a rain jacket, multiple energy bars, a spare tube, tire levers, a multi-tool, sunscreen, keys, wallet, and a phone without requiring strategic Tetris-style packing or leaving essentials behind for lack of space.

The main compartment opens via a waterproof zipper that runs the length of the bag. An internal mesh pocket keeps small items like electronics or arm warmers separated from bulkier gear, which prevents you from digging through the entire bag to find what you need mid-ride. A gusseted side zipper pocket sits on the exterior and expands to hold credit cards, cash, or ID without requiring you to open the main compartment when you stop at a cafe or convenience store. The ripstop nylon outer fabric sheds water and resists tears from branches, frame contact, or accidental drops.

Mounting hardware includes adjustable handlebar straps and a stem tether cord. The straps offer multiple attachment points, which lets you position the bag to clear brake cables, shift housing, computer mounts, or drop bar flares depending on your cockpit setup. The tether cord anchors the rear of the bag to your stem, preventing forward rotation when you hit rough terrain or brake hard. You can also use the bag's webbing loops to attach race numbers during events, keeping your jersey clean and avoiding pin holes in technical fabrics.