Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Must have

After trying just about every other carrier and sling, I love the bjorn. It is easy to put on, won't rub the ground in a parking lot like the slings you have to tie, and feels very secure. It is safe, comforting, and best of all you can wear it when doing chores, shopping with two kiddos (one in the cart one in the bjorn), airports, parties (I think it discourages random people from taking the baby if s/he is strapped to you). I have a child that wouldn't sleep in the stroller, but break out the carrier and she was out! After a long time it hurts my back, but all carriers, including simply holding the child does that. At least if my back hurts, my hands are free :)