CamelBak designed the new Flow Meter to attach to your reservoir straw and remind you how much you've had to drink--good if you know how many ounces gets you over the legal limit at a weekend concert. And also good if you're a training athlete and you need to make sure you drink enough water (it's this newfangled sports drink). Program the Flow Meter with your personal hydration goal and how much your reservoir holds, and it'll tell you how much you still need to drink and how long you have till the reservoir's empty. So with one quick glance, you'll have a totally legitimate reason not to join in your friends' summit push--because hey, 10 ounces won't be enough.