This pack is worn much of the time during outdoor activities. It carries water (120 oz), A extendable Baton, an Extra Digital Camera, Spare AA Batteries (6-12), Sunglasses (prescription), Spare Pistol Magazines (2), Gook Aid, Energy Bars, Peanuts, 550 Cord, LED Lights, Simple First Aid Supplies (Gauze, Tape), Knife, pouch for Radio / GPS. I wrap a Shemagh (scarf) through the carry handle on top of the bag when it is not around my neck keeping the sun off. This bag weighs almost nothing even when it it full of water
The bag has some webbing attachments so I have three misc pouches attached for more storage than the single built in pocket which I use for emergency food / gear
The water is filled from under the bladder. I keep an extendable baton in there which offers easy access (check CCW laws where you live before you do this)