It's pretty precise. I have my copter, controller, 2 sets of props, 4 batteries. 5 ND filters, charger, iPad 3, and sunhood in mine, along with a couple of pens and a notepad. Not much else will fit. I just like it because it is SMALL, is a backpack (and not a carry case), and can be a carry on bag. Anything beyond that goes in my checked bag. (Actually, I put the props in checked luggage as well, since they could theoretically be confiscated <sigh>, although I have no knowledge of this ever happening). Batteries HAVE to be carried on, so the case is helpful in that regard.