CMC Rescue - Adjustable Litter Strap We developed the Adjustable Litter Strap because it allows minor adjustments to be made while the litter is being carried. Quickly releasing the buckle extends the strap, preventing the rescuer from being pulled down with the litter. Sewn loop strength exceeds 36 kN (8,093 lbf). The strap can also be used for pick-offs.