Two cups that work two ways. Nested with the silicone gasket between them they form a double-wall insulated mug with a press-fit sipping lid. Pulled apart they are two single-wall cups, so one brew becomes two.

The set also fits inside the humangear GoKit — it is what turns a Light kit into a Deluxe one.

Specifications

• Outer cup 11.5 oz, marked at 1, 0.66 and 0.33 cups
• Inner cup 10 oz, marked at 1, 0.75, 0.5 and 0.25 cups
• Full set 5.3 × 4.2 × 2 in, 4 oz
• Cups #5 polypropylene; seal silicone
• Microwave-safe and dishwasher-safe
• FDA food-safe, BPA-free, polycarbonate-free, phthalate-free

Liberty Mountain lists this as “CUPCUP 16OZ”. humangear publishes no 16 oz figure for it. The manufacturer’s specification is an 11.5 oz outer cup and a 10 oz inner cup, and those are the numbers above. The 16 oz figure appears in the supplier catalogue only, so it is not repeated here.

humangear styles its own brand name in lowercase. Liberty Mountain's catalogue lists this item as “CUPCUP 16OZ CHARCOAL/BLUE”; the name above is humangear's.