For a beach bag waterproof, essentials include sunscreen, sunglasses, a beach towel, a hat for sun protection, a reusable water bottle, snacks, a good book or magazine, a phone or camera for capturing memories, waterproof phone pouch, flip-flops or sandals, a change of clothes, and a ziplock bag for storing wet items. Don't forget to pack any necessary medications and a first aid kit for emergencies.