Common materials include clear plastics such as acrylic and other general plastics, polypropylene (PP) for small-compartment systems, and wood (often unfinished) for crates. Some plastic containers are noted as BPA-free.
They typically use snap-together tiers and latch systems so each level locks securely to the next. Lids are often indexed or snap-close to keep contents sealed, preventing spills and enabling stable stacking and carrying.
Transparent or clear bases let you identify contents at a glance. Common closure features include snap-close or snap-tight lids and latch closures that secure items and help keep dust out.
Wooden crates are often made from unfinished wood with slatted sides and built-in cutout handles, sized for storage and display and intended to be decorated with paints or stamps. Some listings note Forest Stewardship Council (FSC) certification.
Example inner container dimensions: large 5.9 x 2.5 x 1.8 inches; medium 4.1 x 2.9 x 0.9 inches; small 2.9 x 1.9 x 0.8 inches; mini 2.1 x 2.1 x 0.8 inches. A large three-layer outer box is listed as 9.6 x 6.3 x 7 inches.
They’re described as transparent, BPA-free plastic boxes with multiple shallow cups and latchable lids. One two-pack lists six shallow cups per unit and a 2.5-liter capacity; another listing describes a similar container with a 5.6-liter capacity.