Many models include a bottom liner (solid, holed, or perforated) or an open/bottomless design used with a liner. These options promote drainage and ventilation and allow you to adjust sand depth.
Covered sandboxes often include corner seats, built-in benches, or convertible bench seats. Listed seat/bench capacities in product details range roughly from about 165 lbs up to about 330 lbs, depending on design.
Most covered sandboxes require adult assembly. Some listings include the necessary hardware and even tools or note that no extra tools are required, while others state tools are not provided; instructions and stakes are often included to simplify setup.
Many models offer convertible features such as seats that fold into protective lids, benches that fold into picnic-table tops, integrated toy or storage bins, or conversion into a sensory table—some advertise 3-in-1 use (sandbox, picnic table/bench, sensory station).
Dust-proof or foldable covers and oxford-fabric covers, together with perforated or fitted liners, keep out leaves and debris, shed water, improve drainage and ventilation, and make it harder for animals to access the sand.