Needed a bag to hold my camera and a few personal items for day trips with my wife. I had the Lowepro flipside sport 10L bag and it was tight. The 10L held my Olympus EM5-Mk2 and several lenses with a small region left over for personal items. This new bags split design holds all of my camera gear with similar space available and then adds the top open portion for personal gear. The side pockets are nice for standard water bottles and the straps around the bag make it possible to strap on a small tripod or other rolled up garmet, etc. Overall very happy with the size. Not too large to be cumbersome but not too small either. For me its just right.