Squarish cans are used today for some items (sardine cans come to mind). They usually open with a tab or key along a seam. A hexagonal or octagonal shape could

Squarish cans are used today for some items (sardine cans come to mind). They usually open with a tab or key along a seam. A hexagonal or octagonal shape could use a tab with seam approach. Like a large soda can.