The size is optimal. In addition to my mid-range DSLR fit a telephoto lens, a small tripod and various small parts (batteries, cards, caps, filters, etc.) as well as my on-ear headphones and a Kindle wonderfully to the main compartment or its mesh inner compartments. Instead of headphones a small lens or flash attachment would fit wonderfully.
Here there is only one drawback, because with only a Velcro divider Vanguard was here something economical, but what I can absorb very well neoprene lens covers. In the upper compartment I always transported some rations and drinks, which is wonderful for day trips.
Short: Has everything I as an amateur photographer for mobile applications need is very well made and incredibly light.