Philo in SD wrote a review of Patagonia Stealth Atom Sling on November 27, 2013
Familiarity: I've put it through the wringer
Fit: True to size
It holds several fly boxes, a water bottle, snack bars, sunscreen and a spare spool easily. More than enough stuff for a day down at the river with the exception of maybe a lunch. I made a small mod by having a 1"x3" velcro patch sewn on the top of the main compartment and stuck a foam fly patch with a small magnet. Makes a great staging spot for building a dropper setup.