Packing a Daypack for Changeable Hill Weather

Ask anyone who has spent a long day on the fells and they will tell you the same thing: the forecast is a starting point, not a promise. A still, sunny morning in the car park at the foot of a Lakeland valley can turn into horizontal rain and a biting wind by the time you reach the col. The trick is not to predict the weather but to pack for the fact that it will change — often two or three times before you get back to the car.

A 25 to 30 litre daypack is ample for a full day out in the hills. What matters far more than the bag itself is what goes inside it. The kit below is the sort of thing experienced walkers carry as standard, even on a short ascent on a promising day.

Start with your layering system

Layering is everything in the British hills, because your body temperature and the weather are both moving targets. You want to be able to add or remove insulation in seconds without stopping for long, and you want each layer to work with the others rather than against them.

Pack a spare mid-layer — a fleece or a lightweight synthetic jacket — even if you set off wearing one. On a long climb you will overheat and strip down to a base layer, and by the time you reach the summit ridge you will want that warmth back within moments of stopping. Synthetic insulation is a better bet than down in our damp climate: it keeps working when it gets wet, whereas down clumps and loses its loft.

Your waterproof jacket should live at the top of the pack, not buried at the bottom. A jacket with taped seams, a hood that stays up in wind and pit zips for ventilation will earn its place many times over. Look for something that packs down small enough to grab one-handed while you are still walking. Waterproof trousers are the layer people most often leave behind and most often regret — a squall on an exposed ridge soaks through walking trousers in minutes, and wet legs chill you quickly once you slow down.

Don't forget gloves and a hat, even in July. Wind chill on a summited plateau can knock ten degrees off the valley temperature, and cold hands make things like map reading, zipping a jacket and eating a sandwich genuinely difficult.

Shelter and safety essentials

Every hill daypack should carry an emergency shelter — a lightweight group shelter, a bothy bag or at minimum an orange survival bag. These weigh very little and take up almost no room, but if someone in your party twists an ankle on a remote path, they turn a miserable wait in the rain into a manageable situation. Group shelters also make an excellent lunch stop when the wind is howling and there is no natural shelter for miles.

Pair that with a head torch and spare batteries. Days get shorter than we expect, and a wrong turn or a slower-than-planned descent can mean the last hour happens in dusk. A phone torch is not a substitute — it drains your battery, which you may need for navigation or an emergency call.

• A paper map and compass, plus the knowledge to use them. Batteries fail; paper does not.
• A basic first aid kit with blister plasters, tape and painkillers.
• A whistle, which is far louder and more reliable than shouting.
• A charged power bank for your phone, kept warm inside your pack rather than in a pocket.

Food and water for shifting conditions

Changeable weather burns calories in ways you don't always notice. Battling a headwind, trudging through bog and staying warm all take energy, so pack more than you think you need. The aim is food you can eat with cold hands, without stopping long and without needing to sit down.

Sandwiches, oatcakes, flapjack, nuts, dried fruit and a few squares of chocolate cover most bases. Flapjack is a hill-walking classic for good reason — dense, sustaining and it survives being squashed at the bottom of a pack. Bring something with a bit of salt in it too, particularly on warm days when you sweat more than you realise.

On water, a litre is a sensible minimum for a half-day and two litres for a full day in the hills, more in summer. A flask of hot tea or soup is one of the great small luxuries of a winter walk, and it lifts morale on a grey, dreich afternoon better than almost anything else.

Small kit that makes a big difference

A few odds and ends separate a comfortable day from a grim one. A dry bag or two keeps spare layers and your phone genuinely dry, because pack linings and "water-resistant" zips have their limits in sustained rain. Spare socks in a dry bag are wonderful at the end of a wet day, and essential if you have to ford a stream.

Take sunscreen and sunglasses whatever the forecast says. UV is stronger at altitude, and a bright day after rain reflects off wet ground and water. A buff or spare hat deals with wind, sun and sweat.

Finally, pack it all the same way every time and check it before you leave the house. A pack you know the layout of means you can find your gloves in a squall without emptying half your kit onto a wet hillside. Tidy packing is not fussiness — it is speed and warmth when the weather turns.