According to Garry, every box should be the same. The size of the box will dictate the number of lettuce it will hold, but each box should contain the same number and quality of lettuce for it to become a saleable commodity. That's a lot of rubbish. You give the customer something he wants. The bloke who sells his lettuce is the bloke who has a box crammed full of lettuce.
Consistency is important.
The buyers know whether you have loose packaging or tight packaging. If you're going to achieve a market, and hang onto that market, then you can't vary the product. Giving away samples is another method used to develop niche markets. We would make up 20 boxes filled with every type of lettuce we produced - about 11 varieties. It wasn't costing us anything because we didn't have a market.