The pack goes in my Trekking Backpack. This Hydration Pack is the best of the previous packs I have used, till date. Perfect in every way. It is light weight yet sturdy. The backerplate keeps the pack upright till the last drop of water. Just one Feedback, it would be nice to have a 'loop-like' thing on the base of the pack. This will help one to hang/hook the hydration pack 'upside down' after washing. It will drain the water droplets quickly.