From a comfort perspective, the G1’s design, combined with an adjustable waist belt and wide shoulder straps, allows its weight to be distributed more evenly on a firefighter’s hips.

Source: https://triblive.com/local/westmoreland/murrysville-company-provides-3-1-million-in-air-tank-upgrades-for-pittsburgh-firefighters/

Simply buckle the wide waist belt, then after putting the carrier on, pull the straps tight and tie them in a double knot.

Source: https://www.independent.co.uk/extras/indybest/kids/baby-tech-essentials/best-baby-carriers-a9436251.html