Many wine bottles and especially sparkling wine bottles have a more or less large indentation in the bottom (also called bottle recess, french Culot de Bouteille). There are several opinions about the practical reasons. The indentation probably dates back to the early days of production, when it was not possible to produce bottles in exactly the same shape as today, and this indentation provided better stability or sturdiness. According to another variant, the curvature arose during glass-blowing because the bottle was turned over a wooden stick. The fact is that the curved bottom transfers the pressure better to the walls and ensures that the bottom of the bottle does not break. The argument that this made it possible to pack the bottles "Bouteilles stockées sur Pointes" (head to base) more stable is also valid.