If you plan on going for a run that doesn’t require a fully loaded ruck” then smaller is most certainly better. However most hydration bags are only designed to hold your bladder” maybe some trail mix and that’s it. If you’ve ever had to stuff your keys or wallet in your socks” this one goes out to you! The T.Q. Hydration Pack is their solution for EDC and exercise. First and foremost” the main compartment has a sleeve for your 3L hydration bladder.