A picnic backpack, basket, or hamper. This should preferably have inbuilt insulation. Or get a cooler. Food. Bottled beverages. A picnic blanket, preferably one that’s waterproof. Plates, napkins, glasses, and cutlery. A bottle opener or corkscrew. A thermos for hot beverages or ice packs to keep beer and cold foods cold. Trash bags. Don’t leave your litter lying around. Brings bags to take back your soiled dishes and to take back disposables if there is no trash can around or they’re full. Paper towels. Hand sanitizer or sanitary wipes. Sunscreen. Bugs spray. A portable speaker to play some good music from your device. Picnic toys like kites, frisbees, and balls for a more active picnic. Family board games for a more relaxing one.