I've been holding off because there were no reviews and I'm a little disappointed. Volume isn't mentioned anywhere, but it's just under 19L feels like it should have been about 21-23L. Especially for the price. I knew it didn't have an RFID protection pocket, keychain holder, or weather-resistant zippers, but why? It could stand to have zippers that open the bag a bit more for easier access. I like the bag, but it seems like opportunities to include features that the target audience for this bag would greatly appreciate were seen and possibly considered, but then just thrown out the window. It's not worth the price of admission and I wouldn't recommend it without a nice discount. A discount that pushed my review up by a single star. Also, the water bottle holder can really only hold a bottle with so much girth. You're not fitting anything oddly shape into it, but it would fit a normal-sized water bottle from the store. A larger bottle of smart water might be a bit of a tight fit, for example.