Love it.  This is my EDC, and I feel comfortable carrying this everywhere I go.  This is the bag I consider as the "home away from home", as it carries basic essentials for everyday survival, as well as my work related gear.  I'm also carrying around the 10 inch iPad with a folding cover on it, so there's room for that as well.  The side water bottle holder can COMFORTABLY fit the 40 oz. wide mouth Klean Kanteen; I could not find any information from anyone else regarding this, so I hope that this helps you out with water bottle choices.  Construction is of 1200 Denier cordura, and you can feel like it's going to last forever.  So far it has been with me to a few festivals, all disc golf outings, camping, work, travel, etc etc; no tears, or rips.  You can't go wrong with this bag.