1) Containerful 2) Detergent measure 3) Downy amount 4) Fabric softener amount 5) Heady amount 6) Woolite quantity 
• (n.) As much as will fill a cap.
Cap'ful noun ; plural Capfuls As much as will fill a cap. A capful of wind (Nautical) , 
[n] - the quantity that a cap will hold
noun the quantity that a cap will hold