how to keep lettuce fresh longer

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{"cid":"91202464","title":"3L 5L 6L Stackable Storage Bins With Handles For Freezer Kitchen","imgUrl":"https:\/\/img.chinax.com\/nimg\/e4\/18\/d4ac570fb609d19c2f414c80356a-200x200-1.jpg","attrs":{"Price":"Negotiable","Brand Name":"MC","Model Number":"MC056","Minimum Order Quantity":"Negotiable","Delivery Time":"5-8 work days","Place of Origin":"Zhejiang, China","Packaging Details":"OPP bag + Brown five- layer Carton, Carton size :70 x 45 x60cm CBM:0.19\/CTN","Supply Ability":"30000pcs\/monuth","Payment Terms":"L\/C, T\/T","Product name":"Kitchen organizers plastic storage box refrigerator food container with lid and handle","Type":"Storage Boxes & Bins","Technics":"injection","Shape":"rectangle","Capacity":"3-6L","Specification":"30*15*15CM","Use":"Food","Food Container Feature":"Freshness Preservation","Material":"Superior PP","Color":"Transparent","Sample time":"1-3 Days","Application":"Food, Fruit, Cereal Storage"}}