SUMMIT BACKPACK/DUFFEL BAG COMBO HOLDS A WHOPPING 2815 CUBIC INCHES OF YOUR GEAR. THE FABRIC IS A TWO-TONE LINEN STYLE IN DURABLE 840D PVC FABRIC. THERE IS AN EXTRA LARGE ZIPPERED MAIN COMPARTMENT, ZIPPERED FRONT POCKET WITH A KEY HOOK; TWO ADJUSTABLE AIR MESH SHOULDER STRAPS TO USE AS A BACKPACK OR CONNECT THE SHOULDER STRAPS TOGETHER FOR USE AS A SHOULDER STRAP DUFFEL BAG.