Sand (builders or sharp) is inexpensive and works great, but it is also very heavy. If my 10 gallon growbags had 1/4 to 1/3 sand in the mix, I wouldn't be able to pick them up to relocate, and remixing each year would be more backbreaking than it already is.
I do use sand in my 1 gallon herb containers, the weight is useful to keep them from being blown over.
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