A length-adjustable strap has two plies joined together to form a channel therebetween. The channel generally does not extend the entire length of the strap. At least one extender slidably engages in the channel. The extender may have holes therethrough or recesses that engage elements of one or more fasteners at or near the proximal end of the strap in an adjustment region outside of the channel. Mating screws are joined to the fastener(s) to secure the extender in place. Optionally, the fastener(s) and mating screws are replaced by a tie that threads through holes formed through the first ply and optionally the second ply as well as the hole(s) formed through the extender to secure the extender in place. Multiple fastening connections more evenly distribute the load.