The strap is slid under the casualty: the flat profile can slide easily under the back and the pelvis without lifting the casualty. This strap will form two handles, thus, the team member at the pelvis will have a better grip and a vertical back; the strap crosses in the middle of the back, thus the team member at the head (lifting with four team members) are at the shoulders (lifting with five team members) does not have to put his/her arms between the shoulder blades, and can then lift with a vertical back. The verticality of the back of the team members is particularly important in case of an overweight casualty.