i'm using the ergo back pack at the mo as my nappy bag and loving it! haven't used it actuall yon my ergo yet as isla is too young to go on my back but will when she is. I either where it as a back pack or attack it to my pram as the straps that attach it to the ergo also work fo rattaching to prams. It has a great little section inside that you can get to easily by a zip on the side, as well as a quite spacious normal bit, plus a bottle holder on the side and two pockets for phone, wallet etc. Loving it!

Julie x