Don’t let the wild get in the way of your coffee ritual. The Rambler 4 oz. Stackable Cups are built for those concentrated doses that help you concentrate on what’s up next. BARISTA-FRIENDLY – Designed to fit most espresso machines and dishwasher safe because no one needs more work to do. DURASIP CERAMIC LINING – Combining the classic look and feel of ceramic with the durability YETI is known for, DuraSip Ceramic Lining is fused to 18/8 vacuum insulated stainless steel, making it tough enough to take tumbles and keep on sipping. STACKABLE – The stackability of these cups make them ideal for espresso machines, camp kitchens, and beyond. SHOT GLASS – Not into shots of espresso? Hmmmmm, maybe there are other drinks that come in shot form.