great pak...plenty of space for lenses, cameras, and gear. very durable.. i had to climb belly up down a very rocky mountain with it and the rocks did not even scratch the bag. not a lot of room for extra non photo gear unless you store it with the camera........very water resistant and almost waterproof with the rain cover that is built in...it is a bigger pak....it is not really good to wear for city shoots or any where you don't want a bulkier pak getting in the way or standing out.....great for wilderness..skiing...biking....whatever......my back doesn't get too sweaty either like my old pak........if you are an adventurous shutterbug..you will defn. find a use for this bag.......