Make a Grocery List Supplies: Grocery Ads, paper, glue, pencil
Sack Lunch Bag Supplies: small paper bags, crayons, markers
While you are putting together sandwiches and everything else. Have the kids make a paper bag to put their lunch in. Either have them write their name on it or you write their name, then have them use crayons and markers to draw pictures or design a pattern on the bag. Then when you are having your picnic everyone will easily know who's sandwiches are who's.
Picnic Organization The first picnic of the season write down a list of everything that you brought and put it in your picnic basket so you can quickly gather supplies. This will lessen the hassle of trying to remember everything for the next picnic. You can also add the kids grocery list so they will have their lists for the next picnic also.