A full day on a coastal path is one of the great pleasures of living in the UK, but it is also one of the most weather-exposed ways to spend eight hours outdoors. Cliffs funnel the wind, headlands collect sea fret, and a bright morning in the car park can turn into a soaking afternoon before you have rounded the next bay. The packing list below is the one I reach for whether I am strolling a gentle stretch of estuary wall or committing to a long day of ups, downs and stone steps.

Start With Your Layers

Coastal weather changes faster than inland weather, and the difference between a sheltered cove and an exposed headland can feel like two entirely different seasons. Build your clothing in threes and you will cope with almost anything.

• Base layer — a light, wicking long-sleeved top. Cotton soaks up sweat and chills you the moment you stop for lunch.
• Mid layer — a fleece or thin insulated jacket that squashes down small and comes out the second you pause.
• Outer shell — a genuinely waterproof jacket with taped seams and a hood that stays put in a gust. Shower-resistant is not the same thing, and on a cliff top the difference shows quickly.

Add a warm hat and thin gloves even in July, plus a buff that costs you no space at all. Wind chill on a headland is a real thing, and it does not care what month it is.

Footwear: The One Thing People Get Wrong

Coastal paths are rarely smooth. Expect mud, wet rock, loose shingle, wooden steps, stone stiles and roots that seem to reach for your toes. That mixture rewards sturdy, worn-in boots with decent ankle support and a grippy sole far more than it rewards fashionable trainers. Never set off on a long day in brand-new boots; break them in on short local walks first.

Socks matter as much as the boots. Choose wool or a synthetic blend rather than cotton, and pack a spare pair in a dry bag. If your feet get wet at the halfway point, changing socks is the single best thing you can do to prevent blisters. Take blister plasters, and use them at the first hint of rubbing rather than at the point of pain. Many people also tuck a pair of lightweight sandals in the car for the beach or the pub at the end of the day.

Water, Food and Keeping Your Energy Up

Aim to carry at least 1.5 to 2 litres of water per person. Refill points are sparse on remote stretches, and village taps and cafés may be closed out of season, so do not assume you can top up. A flask of tea or coffee is a small luxury that transforms a windy lunch stop.

• Something substantial — a sandwich, pasty or cold pasta, eaten before you feel hungry rather than after.
• Slow-release snacks — oatcakes, nuts, dried fruit, a flapjack.
• Something salty — crisps or salted nuts help replace what you lose sweating under a waterproof.
• A treat — because a long day needs a small reward on the final climb.

Eat little and often. Coastal walking is sneaky: the gradients are short but relentless, and blood sugar dips catch people out on the last couple of miles.

Navigation When the Signal Goes

Phone signal on the coast is patchy at best and non-existent in many coves and under cliffs. Treat your phone as a backup, not a plan. Carry a paper map of the whole route in a waterproof case, along with a compass, and make sure you actually know how to use both. Note your grid reference at the start and at any point where you leave a clear path.

Keep the phone in a waterproof pouch with a power bank and cable, and switch it to aeroplane mode when you are not using it — hunting for a signal drains a battery faster than anything else. Tell someone at home your route, your estimated finish time and the number to ring if you are not back. If your walk crosses tidal estuaries, beaches or causeways, check a tide table before you leave and note the safe crossing windows.

Safety Kit and Small Essentials

A basic first-aid kit belongs in every rucksack, not just the one belonging to the person who usually carries everything.

• Assorted plasters, blister plasters, antiseptic wipes and a small roll of tape
• Painkillers and any personal medication, plus a note of what you take
• A small head torch, even in summer — an overrun walk in fading light is common
• A whistle and a foil emergency blanket, both tiny and both genuinely useful
• Sun cream and lip balm with SPF; sea breeze hides how strong the sun is
• Insect repellent for summer evenings and wooded sections behind the dunes
• Tissues, hand sanitiser and a small dry bag for keys, cash and phone

Carry a card with an emergency contact name and number in your pocket rather than buried in your bag.

Packing Your Rucksack Sensibly

A 20 to 25 litre rucksack is plenty for a day. Line it with a waterproof liner or dry bag before anything else goes in, then pack the heaviest items close to your back and high up. Keep your waterproof jacket and mid layer near the top so you are not unpacking the whole thing on a windswept stile, and keep snacks in a side pocket you can reach without stopping.

Finally, weigh the bag before you leave. If it feels heavy in the hallway it will feel twice as heavy on the third climb. Take what you need to stay warm, dry, fed, hydrated and find your way home — and leave the rest behind.