I love my ergo and we also had a backpack carrier when DS was little and we went hiking/bushwalking. The Ergo folds small enough to pack in the nappy bag and bub can sleep in there. easy to swap from front to back to side carry (OK side carry is a little more complicated) backpack was aliminum frame so more bulky but bub could sit in it when it wasn't on our back so great for cafe's and eating on the go.