“Crate” means a shipping container holding more than six pint baskets, or the equivalent volume thereof, and no more than 12 pint baskets, or the equivalent volume thereof, used in preparing for market or marketing strawberries for fresh consumption. A shipping container holding six pint baskets, or the equivalent volume thereof, shall be considered to be a half-crate. Assessments on a half-crate shall be one-half of the rate for a crate of strawberries. A shipping container holding more than 12 pint baskets, or the equivalent volume thereof, shall be assessed at a rate determined by the commission.