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The Expander 160 quick release wedge pack has one big (160cubic inch) pouch for holding lots of necessities. It also expands to one HUGE (200cubic inch) pouch. Needless to say, you will not need much more space from a seat bag. 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.