Designed as a day pack, the ERGO Back Pack easily snaps around the straps of the carrier. It is roomy and will fit supplies needed for a day away from home. Put your baby on your back along with the backpack. Access into the sack is from the top with a solid bottom to help keep it's shape. A bottle holder is attached, along with two front pockets and side zipper pocket which offers easy access when being worn. The zipper pocket can also be accessed from inside the backpack. The shoulder straps allow the backpack to be worn independently of the ERGO Baby Carrier. The top handle helps to tote around the backpack when not being worn. Dimensions: 14" high by 14" wide by 4" deep.