First ALWAYS remove the metal or plastic band that goes around your lettuce.
If the lettuce at the store is super wet. SHAKE IT OUT before you put in your plastic bag.
Wet lettuce is soggy lettuce!
When you get your lettuce home, be sure to spin it, shake it or leave on the counter on top of tea towels to dry out.
Did we mention: Wet lettuce is soggy lettuce?
Once the lettuce is fairly dry, take a slightly, barely damp tea towel or paper towel, wrap the lettuce burrito style & place in a plastic bag, try to get as much air out as possible then use that metal band to seal the bag.
Fresh lettuce stored this way keeps up to 10 days!