If you don't like using protein powder, I suggest using 1/3 cup rolled oats instead for a natural source of protein and a more filling factor. (heathermcclees.com)
The rectangular wire improves the slot fill factor (from 51 to 54 %). (greencarcongress.com)
If you don't like using protein powder, I suggest using 1/3 cup rolled oats instead for a natural source of protein and a more filling factor. (heathermcclees.com)