Of the various baby slings I've used, I like this one the best.

Got a new native 4 years ago with my first child before there were so many options. May not be as flashy as the ones you can find today, but it is still a great sling. Folds down to nothing so you can toss in your bag and holds up really well after repeated wash and dry. Makes airport travel a breeze. You can also buy direct from newnativebaby.com. They even sell factory seconds.

I tested and reviewed about 15 different slings. This one was one of my top 5 picks. Proper sizing is a must! No rings to adjust just slip it on and go. Egan my youngest would only sleep in this sling. I probably used it the most at of all my testers and continued to use it well after I wrote my review.