Generally, there are four ways you can tell the difference between a tumbler and a stainless steel mug by looking at the handle, shape, size, and lid; a travel mug is smaller with straight edges and has screw on leak resistant lids with an attached handle. A tumbler on the other hand is taller with tapered edges, does not have a built-in handle, and features a splash proof press on lid.
Let's go a bit deeper into these four defining characteristics:
HANDLE
Most reusable travel coffee mugs have a handle built right into their lids for easy on-the-go transportation and access.
On the other hand, tumblers are completely handle less and do not have a handle built in, but there are options to purchase a handle that slides on in order to convert it into a travel mug.
SHAPE
Travel mugs tend to have straight sides and are shorter than tumblers; tumblers however are taller and have a wider opening that taper down to a more narrow base.
SIZE
Many styles of travel mugs come in 12oz and 16oz sizes, but generally do not go above 16oz. Some tumblers may have 16oz options, but they are most commonly available in 20oz, 30oz, and 40oz options.
LID
Finally, travel mugs generally feature specially designed leak resistant lids that are screwed on and secured by a rubber grip. As mentioned above, there is also a handle attached to the screw on lid.
Conversely, tumblers are characterized by a push- or snap-on splash proof lid with a larger opening to allow for sipping out of straws; some tumblers even come with a built in straw.
What's the Difference Between Leak Proof and Splash Proof?
Leak proof lids is one that prevents any liquids from spilling out of a container if it were to be knocked over or dropped. A splash or spill proof lid is one that prevents any liquids from spilling out due to minor disturbances such as walking quickly or bumps in the road.
In other words, leak resistant lids are much better at containing liquids than splash proof lids.