IKEA TwinOrb Ring

You can use two bowls from the IKEA BLANDA series—stacking them with this ring inserted between them—to create a sealed container suitable for storing food. I use this setup for sourdough starter.
IKEA BLANDA does not have a single size. It comes in four main diameters and three different materials (stainless steel, clear glass, and bamboo).The standard diameters available are:12 cm (4 ¾ ") – height 6 cm, capacity 0.5 liters20 cm (8 ") – height 9 cm, capacity 1.6 liters28 cm (11 ") – height 13 cm, capacity 4.5 or 5.4 liters depending on the material36 cm (14 ") – height 16 cm, capacity 11.5 liters. The exact diameter depends on the specific model you choose. BLANDA BLANK (Stainless Steel) is available in all four sizes (12 cm, 20 cm, 28 cm, and 36 cm).BLANDA MATT (Bamboo) is available in 20 cm and 28 cm sizes.BLANDA (Clear Glass) is mainly available in the 20 cm size.
To get a full 360° ring with smaller pinters you have to print and assemble 4 x 90° item versions.