Collapsible hand saw with tubular frame doubling as storage container for other components

A collapsible hand saw comprising:

• an elongated tubular frame member having a first end and a second end situated oppositely of one another in a longitudinal direction of said frame member, and a hollow interior that runs longitudinally therethrough;
• a first pair of holes in said elongated tubular frame at a first location proximate the first end thereof, said first pair of holes comprising a first top hole in a topside of said elongated tubular frame, in a reference position of the hand saw, and a first bottom hole in an opposing underside of said elongated tubular frame;
• a second pair of holes in said elongated tubular frame at a second location proximate the second end thereof, said second pair of holes comprising a second top hole in the topside of said elongated tubular frame and a second bottom hole in the opposing underside of said elongated tubular frame;
• a first arm for attachment to the elongated tubular frame at the first location in an installed position spanning outward therefrom at the underside thereof through the first bottom hole, said first arm having a respective attachment end that is insertable through said first bottom hole, and at or adjacent which said first arm is configured for hooked engagement with the frame member at a boundary edge of the first top hole therein, and a respective mounting end at or adjacent which said first arm is configured for selective coupling to a bowsaw blade at a respective mounting hole in the bowsaw blade near a respective first end thereof;
• a second arm for attachment to the elongated tubular frame at the second location in an installed position spanning outward therefrom at the underside thereof through said second bottom hole, said second arm having a respective attachment end that is insertable through said second bottom hole, and at or adjacent which said second arm is configured for hooked engagement with the frame member at a boundary edge of the second top hole therein, and a respective mounting end at or adjacent which said second arm is configured for selective coupling to the bowsaw blade at a respective mounting hole in the bowsaw blade near a respective second end thereof;
• and
• an adjustable tensioner connectable between the frame member and the first arm at a first tensioner connection point on said first arm and in a position that, when tightened, pulls the respective mounting end of first arm away from the second arm and toward the first end of the frame member to tension the bowsaw blade;
• wherein the hollow interior of the frame member is sufficiently sized to accommodate simultaneous storage therein of at least the first and second arms and the adjustable tensioner.