Has anyone used a back carrier? I live in the country and would to start hillwalking with my LO and my dog! She is 7 months old but would like to be able to use it for quite a while, especially as they seem to be quite expensive! I had liked the look of the littlelife ultralight backpack. Anyone got any reviews or suggestions? Hoping it will help in my quest to shift the babyweight too! Also need to be able to put it on without any help!