Stackable glasses
The stackable tumbler is the type of tumbler most sought after by venues: in fact, stackability is the main feature that makes a tumbler practical for everyday use, but especially ideal for those who do not have a lot of space to devote to stocking glasses or for those who serve a large quantity of drinks.
TALL TUMBLER GLASSES: THE INTERNAL GROOVE
To be defined as such, stackable glasses in general, and tall tumbler glasses in particular, must have an internal groove, a small gap that, by stacking them one on top of the other, creates a space between them that does not cause them to get stuck. This prevents all those micro-fractures that, with assiduous use, are created leading to the breakage of models that are not stackable but mistakenly used as such.
>>> The RGLife in-depth: Stackable tumblers: quality and trendy design.