I think it would depend upon how big your camera is and what else you want to carry.
I was able to carry two 20 oz sodas, a small id case/wallet, small camera, a kid's sun hat, small pack of babywipes, a bottle of tylenol, sunglasses, asthma inhaler, cell phone and a couple of plastic baggies in mine when we went.
My recommendation - find a store that stocks them, bring your camera and everything else you want to carry and try putting it all in.