M.S.
I have a 22-pound 14monthold dd and we use several kinds of carriers. IMO, a one-shouldered carrier is only going to work for an extended period of time if you're using it to do back carries. One-shouldered carriers include ring slings and pouches (Hotslings, Maya Wrap, Taylormade.)However, they do fold down really small and work great for quick ins-and-outs. If you would like to distribute weight better and be able to carry longer, I would recommend a two-shouldered kind of carrier, such as a long wrap (like Ellaroo) or my personal favorite, the mei tai. (Yes, I do make them--thanks Carrie! see www.close2mebaby.com) I would not recommend a stretchy wrap for a baby over 15 pounds although it is theoretically possible to use one. Too much potential to sag. Peppermint.com, mom4life.com, attachedtobaby.com, bellytobaby.com are all sites with lots of slings and sling reviews. IMO, there are better options out there for you than the playtext hipster that will last a lot longer and be ready for the next baby. (Most are good for newborn-35 or 40 pounds or three years old.)