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The Expander 75 quick release wedge pack has one expandable pouch for holding lots of necessities. Its normal size is 75 cubic inches, enough to hold a multi tool, a spare tube and a CO2 inflator. When you open the expansion zipper, you can add to that a cell phone and wallet! This bag includes an internal attached key hook and has a plastic internal skeleton so it will not lose its shape. There is reflective taping on three sides for visibility and a tab on the back for attaching a tail light. Color: black.