Outer Shell Half Frame Bag

Fits: The top half of the main triangle. Small 17 x 4.25 inches, Medium 18.5 x 5.25, Large 20 x 5.75, all 2.25 wide; print the templates below to check your frame.

A frame bag that uses the top half of the main triangle, leaving room below for a bottle on most frames. Outer Shell builds it with a foam structure that protects both the contents and the frame, water-resistant zippers with garages so the pulls do not jangle, and extra-long straps you can move or trim to fit your tubes.

Three sizes, all 2.25 inches wide. Small: 17 inches long, 4.25 tall, 1.9 liters, 9 ounces. Medium: 18.5 long, 5.25 tall, 3.1 liters, 9.7 ounces. Large: 20 long, 5.75 tall, 3.5 liters, 10.3 ounces. Interior pockets. 1000D Cordura, or ECOPAK EPLX600 on the ECOPAK colors. Made in the USA.

Sizing: measure the empty space inside your frame where the bag will sit and compare it to the numbers above, or print Outer Shell's full-size templates and hold them against the frame: Small, Medium, Large. Still unsure? Email us a photo of the bike and the frame size.

Why we carry it: tube, tool, pump and food on any bike, and on a gravel bike it means no more overstuffed jersey pockets. If the bottle is tight underneath, the Wolf Tooth Morse Cage can drop it up to 32mm.