Portable and Towable Concrete Mixers for Rent | United Rentals
The smallest concrete mixer can hold 1/2 bag of concrete. A 6 cu. ft. mixer can hold 1/2 to 1 bag, and our largest 9 cu. ft. mixer can hold 1-1/2 to 2 bags. Mortar mixers can hold a little more mix. Our 6 cu. ft. mortar mixer can hold 1-1/2 to 2 bags, and our 9 cu. ft. mortar mixer can hold 2-1/2 to 3-1/2 bags.