Abstract: A portable knock-down seat which telescopically extends laterally to become a bench for use by sportsmen, as a shower chair, as a patient transfer bench, or as a stool. The portable seat comprises a laterally extendable telescopic bottom, a detachable and laterally extendable telescopic back, two detachable and vertically adjustable telescoping leg assemblies, and detachable armrests. The portable seat may be transported in a carrying bag or backpack, or by using straps.