Good old SIGG
Everyone recognizes these bottles. What's the story? SIGG was founded in 1908 to manufacture all kinds of things from aluminiminmum: cups, kettles, and so forth. The water bottle was added to the selection very appropriately: they had scrap pieces of metal from other produce and wanted to minimize waste.
SIGG was contracted by the Swiss armed forces to manufacture the flat M32 canteen - an item we have sold when we can find them. The round bottle was actually a hot water bottle up to the 1960s before it was rebranded as a drinking bottle.
Born as a side-product from scraps, the SIGG bottle became an iconic artifact and the company's primary offering while other products have been discontinued. Not perhaps the result they were expecting when making the first bottles 100 years ago, but a really good one!