Also known as a car bag or footmuff, a bunting bag can also be a snowsuit-type outfit that either has the legs joined (to look like a “bag”) with a hole in the middle for the harness system, or a thinner fleece-like suit that is thin enough to not interfere with the safety of the harness system. This item is usually used on infants under 6 months, or while they are in the infant car seat stage. A Bundle Me type of product has usually been the most popular at Moms to be and More due to its safety testing, and ease of use. Suits that are very thick and/or bulky may interfere with the harness system, and may cause your infant to over heat. It is much easier to be able to pull down a layer on a bunting bag, then to undress your infant without disturbing them.