I really like this backseat organizer. It has lots of pockets of varying sizes that can hold all kinds of stuff. It’s made out of sturdy nylon fabric and the two straps hold it securely in place so it doesn’t flap around. I especially like the bottom strap that goes around the seat and keeps the bottom of the organizer secured. The pockets are in reach of my 4 year old in her car seat which means less reaching around to hand her things like a bottle of water or a toy. It has one large mesh pocket at the top, then in the next row it has two bottle sized pockets and one larger pocket, finally the bottom row has 2 layers: the outside layer is 2 mesh pockets that equally divide the bottom row and behind them is a full width solid pocket.
It’s currently available for $8.87 on amazon: http://amzn.to/1Wphq4Y
Full disclosure: I received this for free or at a discount in exchange for an honest review.