Here is a nice size to first try and see if it will work for you.
Golden Flax Seed is grown for the food market. It has a nutty flavor makes it a excellent source of Omega 3 nutrition.
There are two types of flax seed. Brown and Gold, the golden is the choice seed for human consumption, it has a nutty flavor, with no bitter aftertaste and grinds nicely.
If you want to save money, purchase the 1gal size. Shelf life on the golden flax is 2 years