2000 cubic inches (20″ H x 12.5″ L x 8″ W). 500 more cubic inches opens up a variety of hauling options for those commuters who cannot resist bringing it all. (And that means you). The same great two layer design keeps everything on the inside snug and dry while the ballistic nylon shell takes all the abuse. A freshly re-designed liner is stronger than previous versions and totally replaceable for about the same cost as a good sixer of brew.