According to a first aspect, load-bearing systems can have one or more serpentine tensioners. According to another aspect, load-bearing systems can have one or more repositionable load-bearing members. Load-bearing systems having serpentine tensioners and load-bearing systems having repositionable load-bearing members are not mutually exclusive of each other. Accordingly, some disclosed load-bearing systems have a serpentine tensioner in combination with a repositionable load-bearing member. To facilitate disclosure of such principles, wearable packs incorporating one or more aspects of innovative load- bearing systems are described.