Mini - 33 cubic inches (5.5” L x 3” W x 2.5” H). Sized for the road essentials: spare tube, tire levers, mini tool and change or keys if you are so inclined.

Small - 40 cubic inches (5.75” L x 4” W x 2.75” H). Great for either a road bike with extra gear or mountain bike if you are carrying just the basics.

Medium - 65 – 81 cubic inches (6.75” L x 4” W x 3” H unexpanded). Holds a full complement of inner tubes and tools, or wallet, snacks, etc. Expanding bottom for extra capacity when you need it.

Features : 

• Rugged 1680 denier, ballistic construction with full liner
• Padded top and bottom
• Three interior pockets to organize your gear
• Gusseted sides help keep things in place when you open the bag
• Hidden lower expanding panel adds extra capacity
• Web loop for light
• Inside key clip