The 21″ model is the original Sven-Saw, invented in 1961 and made in the USA ever since. It weighs less than 14 oz, folds to a compact 23″ x 1.5″ x 5/8″ and rips easily through 6″ logs. The blade folds into the handle so it’s safe to slide in and out of a pack, throw in the trunk, and keep in the house or garage.