A single-tube crutch (100) includes an upper leg (101) and a lower leg (301). The lower leg (301) can be fully insertable into a first end of the upper leg such that only a slip-resistant tip (102) is exposed. The single-tube crutch can include an underarm support (104) coupled to a second end of the upper leg opposite the first end. A grip assembly (105) translates along the upper leg between a usage position and a stowed position.