In the side mesh pockets can easily carry little things like 1-2 replacement batteries and possibly even spare memory cards. While there are inside, under the lid, two pouch for memory cards, which I will not use it because they are not secured by elastics and me so the risk is too great that there slip out deposited memory cards when opening and closing the bag unnoticed and lost.
A small drawback is the somewhat unfavorable balance of pocket if you are wearing the supplied shoulder strap: you "tips" then as 15-20 degrees backward. Had the eyelets for the belt 1-2 cm mounted further back, the balance would certainly be in order. But anyway, that's a bit ugly, but not really disturbing.
Although there certainly interested hardly anyone today: I do not know how the manufacturer comes up with the idea, in this case a passe EOS 300D ... No, not defintif! I own the 300D still got it but do not have to try, because it's so obvious that the case for the 300D is far too small easy.