The actual waterproof backpack part would calm can be even a few cm greater. But I get here my Canon 1D X with attached wide-angle and my 70-200 f2.8 under with sun visor. The upper part of backpack is big enough for a raincoat, 1 L bottle drinks, meals and div. Photo accessories. Great part - better I've even after a long search on the web can not be found. For this, a very good processing. We recommend.