Jan at Sleeping Baby has made up handouts regarding the safety of Bag Slings.
So has Susan at Sweet Pickles. Print them out and keep them with you.
Great article with pics. Susan is working on a handout also.
Just for reference, here is the official CPSC release regarding slings.
They did not make a distinction as to which slings are dangerous, which is too bad. So it's our job to educate. Use the handouts we linked above. Be a great example by wearing your baby properly and safely.