Packing a beach picnic that holds up in the sun

Warm sun is hard on cold food and on anything loose, so a beach picnic needs a little planning before it leaves the kitchen. Most picnics that fall apart on the sand do so because the cooler warms up after too many openings, a sandwich built with wet fillings turns soggy by noon, or a bag of chips sits open in the wind. A few deliberate choices before you leave prevent all three.

Keeping the cold chain intact

Start the day with a cold cooler. Chill it overnight if you can, and fill it with cold items rather than letting it warm in the car. Frozen water bottles or gel packs work well, because they keep food cold and later become cold drinks. Pack perishable food, including cooked meat, dairy and cut fruit, in the coldest part of the cooler, usually at the bottom under the ice packs. Keep drinks in a separate cooler, since they are opened far more often than the food and every opening lets warm air in. A cooler with empty space inside warms faster than a full one, so fill the gaps with extra ice packs or wrapped towels.

Food safety rules set the firm limit here. The USDA's general guidance is that perishable food should not be left out for more than two hours, or for one hour when the temperature is above 90 degrees Fahrenheit (32 degrees Celsius). Cold food should be kept at 40 degrees Fahrenheit (4 degrees Celsius) or colder. When the time limit has passed, discard the food rather than trying to save it, because bacteria can grow in warm food without any change in its appearance or smell.

Place the cooler in the shade of an umbrella or under a towel. Sand heats up quickly in full sun and warms the base of a cooler, so setting it on a folded towel or a mat helps. Decide what you need before you open the lid, and close it again between items.

Choosing food that travels well

Pick foods that tolerate some warmth and handling. Firm fruit such as apples, grapes and oranges holds up better than soft fruit. Berries are soft and crush or leak in heat, so keep them in the cooler until serving. Hard cheeses, whole-grain crackers, nuts, dried fruit and sturdy bread keep their shape. Cut vegetables packed in a sealed container stay crisp when kept cool. Foods that depend on staying cold, such as soft cheese, cream desserts, cut melon and mayonnaise-based salads, should stay in the cooler until serving time and be served in small portions, so the rest is not left out for long periods.

Portion food into reusable containers with tight lids. This reduces how often each container is opened, keeps sand out and lets people take what they want without disturbing the rest. Put sandwiches in a sealed container or zip bag in the cooler, and keep wet fillings, spreads and dressings separate until serving to prevent sogginess.

Packing for sand and wind

Wind is the enemy of loose items. Use a rigid box for bread and anything fragile, and keep napkins, plates and cutlery together in one container so they do not blow across the beach. A tablecloth or blanket with corner weights, such as small stones or sealed bags of sand, keeps the spread in place. Bring a dry towel to set food on, a small trash bag and wipes for hands, since sand gets on everything, including the food.

Bring water for hands and cups, because a tap may be a long walk from the spot you choose. Pack the picnic in the order you will need it, with drinks and napkins on top and the main food beneath, so the cooler does not have to be emptied to reach one item. Keep a second bag for trash and recyclables, and plan to take everything home.

What to leave at home

Some items cause more trouble than they are worth on a beach. Glass bottles and jars break easily and are restricted on many beaches, so decant condiments into plastic containers instead. Large whole melons are heavy to carry across soft sand and can be cut at home. Chocolate and anything that melts at warm temperatures should stay home or be swapped for something sturdier. Anything that needs cooking or reheating is better done at home, since many beaches restrict open flames and portable stoves.

Strong-smelling foods and open pastries attract gulls and insects, so keep them covered and close to hand while eating rather than leaving them on the sand. A bag of food left unattended on a blanket is an easy meal for a passing gull. Bring only the amount you expect to eat, and carry any leftovers back in the cooler if they are still cold enough to keep.

Plan the picnic around the length of your stay and the size of the cooler. Before you leave the house, make sure every perishable item is in the cooler, since the two-hour limit starts once food leaves cold storage. A light, cold, easy-to-clear picnic leaves more of the day for the sand and the water, which is the reason for the trip in the first place.