a good woven wrap would be the ultimate support for someone with a dodgy back as you can tailor where the support goes for the most comfort by wrapping in diff ways plus they come in all different lengths from about 2metres to 5 metres in length. brands to look at are didymos, vatanai, storch....... failing that most of the meitais like baby hawk and kozy come in an XL strap version as well and are very supportive for both mum and bub up to a good size.