The Snugpak YokeThe Snugpak Yoke attaches to the side pockets of the Rocket Pak and the Bergen Pack to allow the user to create a small and versatile daypack. This creates a great system and can be easily stowed and packed in the Rocket Pak or Bergen Pack with all your other gear and deployed when needed. When the two 915 Cubic Inch (15 Liters) side packets are attached you have a small and agile 1830 Cubic Inch (30 Liters) daypack.