A sheath or scabbard has two functions: 1) to cover the blade, protecting it from moisture and others from accidental injury, and 2) to allow the sword to be worn. A sheath is made of soft material (leather, cloth, etc.) and is relatively pliant. Most knives are housed in sheaths.

Sheaths are blade storage cases made of leather, which makes them lighter and more flexible than scabbards. Sheaths can also be curved or straight depending on the blade. While some have a single opening similar to scabbards, others have two, one at each end. Some sheaths have straps that attach to a belt or buckle.

A scabbard is a sheath for holding a sword, dagger, knife, or similar edged weapons.