The bag, in its most elemental form, is a flat piece of material given volume by where it is gathered and held. The earliest examples — animal skin, woven fiber, cloth — were not constructed so much as arranged: folded at the edges, secured with cord or tied at the corners (Fig.1). No additional components, no internal structure. As commerce and travel expanded through the 18th and 19th centuries, bag construction became more formalized, adding gussets for depth, reinforced bottoms for load, rigid panels for shape. The newsboy bag of the late 19th and early 20th centuries was a counterpoint to that tendency — a simple canvas satchel slung over the shoulder, designed to hold newspapers, coins, and little else (Fig.2). Its utility came from the absence of anything unnecessary. Each addition to bag construction solved a problem and introduced a new one. The flat panel, folded, remains the origin of every bag made.

The bag has no fixed shape. Because its structure is determined only by a folded panel and four strips of ultrasuede, the silhouette is subject to what is carried and the effect of gravity on the fabric. Contents and load distribution alter the form each time. There is no engineered shape the bag returns to. A parallel tradition in Japan — the furoshiki (Fig.3), a single square of cloth used since the 8th century to wrap and carry goods of any size — operates on the same principle. Before it was associated with public baths, furoshiki was called hirazutsumi: flat folded bundle. In origami, volume and structure emerge entirely from how a flat sheet is folded and where. No material is added or removed.

The earliest tennis bags, appearing in the late 19th century as lawn tennis became a structured sport, were made from canvas or leather and designed to carry one or two racquets. Over the following century they expanded into rigid, compartmentalized structures built around the demands of professional play. For the recreational player the load is lighter — a racket, a towel, a change of clothes — and the open tote has always answered that need without the architecture of a bag designed for the tour.