This cup is designed specifically for watercolor artists.
It’s incredibly thin (only 12 mm, or 1/2 inch) and its maximum capacity is 270 ml (9 oz).It is also retractable onto different levels, providing a variety of capacities from 150 to 270 ml (5 to 9 oz).
Can also be used as a small ink tank.
 
Equipped with a strong stainless metal rim, especially polished not to damage the brushes, the foldable cup itself is made of a solid piece of easy-to-clean, high-quality silicone. It fits easily into a folder, a bag, or just a pocket. The cup comes with a lid that fits very tightly, not allowing water to spill, and a cord for quick attachment to a bag or backpack.
 
Unfolded height 80 mm (3 5/32 inches)
Diameter 95 mm (3 47/64 inches)
Capacity up to 270 ml (9 oz)
Weight 85 g (3 oz)