What You Want in a Bag- Pockets 3

We don't just want pockets on the inside of our bag, we want some very specific pockets on the outside of the bag, as well. I have decided to include three elasticized and pleated pockets on the bag gussets- one for a cell phone, one for an mp3 player, and the final one for a half-liter bottle of water (or, in my case, iced tea sweetened with apple juice). Also on the outside of the bag will be a detachable key clip. I thought about providing a pocket for them to settle into as well, but our keychains are all so different in size! What do you think?