The typical capacity of a compact washer suitable for apartments is 2.5 to 3 cubic feet according to tech website CNET. This is sufficient for approximately eight to twelve pounds of load per wash.
Compact washers have much less internal capacity than full size front-loading full-sized washers, which range in capacity from three to five cubic feet. Some compact washers intended for use in apartments are paired with dryer units in a stacked configuration. Such washers are typically smaller than compact standalone washers; CNET reports that the typical size of the washer in such an arrangement is 2.11 to 2.44 cubic feet, sufficient for eight pounds of laundry per wash.