Another addition to my rapidly growing collection from 'free range kids', the ergo backpack. A really useful addition although not quite as indispensable as the front pouch. It's a nice size and actually fits in far more than it looks like when you first open it. Fit's a days cloth nappies, change of clothes for 2 and cups inside no problems without looking massive, or going too out of shape.
Fits very cleverly to the ergo although I struggle a bit to get baby in with backpack already attached, and I don't always have someone to put it on afterwards. I think that may just be practice. Brilliant for being hands free though!