Our 7 year old Littlelife back carrier is no longer working for our 2.5yo. He's only a titch at about 1st 11lb but the carrier is now lacking the strap which secures it across the chest and DS3 really struggles to stay upright and comfortable in it. I need some sort of carrier to go for dog walks with until DS3 gets significantly more reliable at walking. I'd love something like a Tula but I don't really want to pay that much. Does anyone have any experience of the mei tai type ones on Amazon around the £30 mark?