Sackful
/ˈsækfʊl/
Definition 1 of 1
Pro Tip 1/3Quantity Indication
A sackful implies a considerable quantity, often as much as one can carry in a sack. 
After the harvest, each worker received a sackful of grain as a bonus.
Pro Tip 2/3Context Specific
Understand the content to gauge the size; a sackful of feathers is different from a sackful of rocks. 
She bought a sackful of feathers for the pillows, which was surprisingly light.
Pro Tip 3/3Informal Use
Sackful is usually used in casual conversation or writing, not formal contexts. 
I have a sackful of laundry to do this weekend.