I have a heavy 2 and a bit year old and we are off to wales in a month or so. i have a ring sling but i find after a while it now pulls a bit on my shoulder and back so i'm after some advice on back carriers (not the framed type) as to what people find comfortable and where to buy. I'm 5'4" and would like one that goes up to between 40 and 50 lbs. i would like one thats quite easy on the in/ out for me and him as i think we'll be doing quite a lot of walking and his legs may get a bit tired etc.