A Medium bag of worm castings are approximately 1/2 gallon or 5lbs.
Worm Casting Compost:
Worm Castings are the ultimate natural soil supplement. At American Worm Growers, we create Worm Casting Compost the natural way, sifting every bag by hand. 
Worm Casting Benefits:
Natural time release of nutrientsWater Retention benefits due to the worms' composting processIncreased immunity benefits to plants treated with worm casting compost
 
Application: (for best results)
Prepare planting area
Mix Worm Casting Compost into planting area
For every 3 parts soil mix 1 part Worm Casting Compost