Nate has been practicing pulling around his new rolling backpack containing one of his D tanks of oxygen. He can pull it for really short distances before he topples over or can't hold it anymore. That's a start, since it is pretty much as big as him in the first place. He needs it for times when he wants to venture out a bit by himself in dr. office waiting rooms and Abby's school and such. He keeps trying to pull the big tank with him, but it is just too heavy, so we'll try wheels instead. So far, it's working fine if he isn't too tired.