Great day bag! - Arc'teryx Mantis 26 Backpack

I bought this for a trip where i'd be traveling for almost every weeks. I used it as a carry-on and then as my day bag. It worked great, was comfortable to carry. The sternum strap is a little high on me, I'm tall and have about a 20" torso, but it worked okay. I didn't use the hydration sleeve, rather I carried a 27 oz. Klean Kanteen in one of the side mesh pockets. There is no way to secure the bottle in the pocket so it would slip out if I leaned over or when taking the pack off. Overall I am very happy with the bag.