This video shares what could happen when back wrapping with a stretchy wrap. Please use only woven wraps for back carries. If you are not able to afford a commercial woven, a crinkle cotton gauze or a table cloth can be made into a wrap very easily if you DIY.
The safety of your baby is the most important thing to remember when selecting a carrier.
*This video is not made by BWI, thank you to the maker of this video for sharing the reasons to avoid stretchies for back wrapping.