Well, my Lucky was only supposed to be 5.5 at the most....lol He is closer to the 8-9 lb! I think, in his opinion, it makes him more manly!! He don't like being carried around outside (hurts his image)lol
But seriously.....you don't HAVE to have these little babies up in arms to give or get love...you can just find where YOU are most comfortable and they will come to you!!!
Good luck with your back....and your search!