With strategic packing, you can fit everything you need for a day at the beach into one bag. Choose a spacious, durable beach bag with multiple compartments. Pack essentials like sunscreen, towels, hats, snacks, water bottles, and a first aid kit. Use smaller pouches or bags to organize items like toys, diapers, and clothes. Opt for lightweight, compact versions of items when possible to maximize space without compromising on necessities.