Most rolling double-rod racks use four swivel (360°) casters for easy movement and maneuvering. Commonly two of those wheels are lockable so you can secure the unit in place when needed.
Sorting capacity depends on the number and size of liners. Typical examples: two-section sorters commonly use two ~13-gallon liners (about 26 gallons total) or variants totaling roughly 20 gallons (75 L) split into sections; three-section models often list about 39 gallons total (three 13-gallon liners). Verify the liner volume in the product details for exact capacity.
Removable Oxford-cloth bags—often with hook-and-loop attachments—are easy to detach for carrying to the washer and for spot cleaning; some are waterproof for easier wiping. Plastic bottom panels or rigid inserts in some designs prevent sagging and make carrying full bags easier and neater.
Assembly varies by product. Some racks require adult assembly with provided tools, while others advertise tool-free or no-tools-required setups with snap-together parts for quicker assembly.
Common extras include top utility or wood-panel shelves for detergents, bottom storage shelves, side hooks for accessories, removable baskets or liners for sorting, and extendable hanging bars for longer garments.