When travelling light is not an option the Bergen is ideal. As the Rocket Paks bigger brother, it has all the same features but the main compartment is a hefty large 4,270 cubic inches / 70 liter on its own. Also as the Rocket Pak the Bergen too has two removable side pockets ( 915 cubic inches / 15 liters each) which are compatible and attach to the Snugpak Yoke System. There are side compression straps to minimize those side pockets if empty. There is a zipper compartment on the top and bottom. The top zippered compartment is a great place to store those essentials that need to be easily accessed. Just like all of our other backpacks the Bergen's back panel system is a heavily padded air permeable system for comfort and outstanding back protection. It also has contoured and heavily padded shoulder straps faced with textured high wicking fabrics. The bottom compartment also houses a roll away rain cover.