One way to keep lettuce fresh is to place the washed and dried leaves in a container with a paper towel to absorb moisture. This container can be either a zippered storage bag or a covered hard container. Keep the lettuce stored in a refrigerator until use.
Wash the lettuce and allow it to dry, preferably using a salad spinner. Wrap it gently in paper towels before placing it into a large storage container or sealable bag. The bag or container must be large enough to hold the lettuce leaves without squashing them. Keep the containers sealed in the refrigerator to avoid excess ripening from exposure to other vegetable or fruits.