It's super easy.
Take a mason jar... or anything similar and pour in your preferred salad dressing. Then toss in all your chopped veggies (NOT the lettuce!). Top with cheese then add your lettuce on top. Make sure the lettuce does not come in contact with the dressing. This allows you to keep the salad for a week!
I only had four large jars on hand so I'll need to invest in some more. :) I also made some pasta salad and stored those in smaller jars for Matt to take along with his sandwiches.
Mine had poppyseed dressing, carrots, green pepper, red pepper, onions, cheese, chicken, and lettuce!As an extra I boiled some eggs and have them stored in the fridge. I'll break and slice right before eating. :)