The BioBack utilizes adjustable straps, which allows the standard size BioBack to fit people with waist sizes ranging from 22" to 48" inches. The Large size BioBack can accomodate waist sizes up to 78".
The video provided below demonstrates how to easily adjust your BioBack for a perfect fit. There is also a link to a PDF with written fitting instructions. Each BioBack comes with both written and video instructions and fitting instructions can be found on YouTube in multiple languages.