The Reissversschluß on the top is convenient because you can take the camera in this way - it is advisable for the center to position the camera in your pocket.
The zippers have zipper on it, but that you get for a few cents nachzukaufen everywhere and then let the zippers from the corners and close more easily.
The only minuses - but -not without penalty opportunity to attach a tripod and the top is not padded and not amplified. therefore you have to give care that does not hit from the top of the bag.
Clue to estimate the size, because you do not necessarily know exclusively with Cm-information, which really fits in:
With me find a place - Canon 60D as Canon EF 100mm Macro IS USM + Canon 6D with og optics additionally a standard lens Tamron 24-70mm and a flash Metz AF44. Plus bits and pieces batteries, memory cards, bellows, foldable, Vorsteckfilter with holder, small "T ... can" with remote triggers - so really accommodate a large equipment.
and the bag comes clear with the weight of the equipment.
For my part, a buy recommendation - I would buy this bag again!