Nothing ruins a hike like something you forgot: the water bottle running dry halfway round, the warm layer left at home when the wind picks up, or nightfall catching you without a torch. Packing your rucksack properly isn't about bringing everything — it's about bringing the right gear, not too much, not too little, so you can walk light and worry-free.
Here's everything you need to pack in your hiking rucksack, category by category, with a handy checklist at the end. Whether you're heading out for a few hours or a full day, this list covers the essentials — starting with the three must-haves we always recommend.
Our selection
Three items that turn up in every seasoned hiker's rucksack: something to drink from anywhere, something to handle minor mishaps, and something to light the way if your outing runs long. We'll cover the rest just after this.
The rucksack: the foundation of everything
Before you even think about filling it, you need the right rucksack. For a day out, 20 to 30 litres is plenty; anything bigger and you're into trekking territory. The rucksack should sit comfortably once loaded, with a hip belt that shifts the weight onto your hips. If you're unsure on capacity or model, our guide to choosing your hiking rucksack covers it all, and you can browse the full collection.
Hydration: priority number one
This is the first thing to sort out, and one you should never skip. Reckon on 1.5 to 2 litres of water for a day hike, more in hot weather. Classic water bottle, insulated flask, or a hydration bladder tucked into your rucksack with a drinking tube: it's down to personal preference. If your route crosses streams or lakes, a filter bottle means you don't have to carry all your water from the start — you can filter as you go, with total peace of mind.
Food: energy within easy reach
Walking burns energy. Pack energy snacks that are easy to grab without stopping: dried fruit, cereal bars, nuts, a bit of chocolate. For a full day out, add a proper meal - a sandwich, pasta salad, or a freeze-dried meal if you want to travel light. Always keep a small reserve in case of the unexpected.
Clothing: the three-layer rule
In the mountains, the weather turns quickly. The answer lies in three layers that you add or remove depending on effort and conditions: a breathable layer next to the skin (which wicks away sweat), a warm mid layer (fleece or lightweight down jacket), and a windproof waterproof layer on top. Even in glorious sunshine, a light fleece and a windproof layer always earn their place at the bottom of your rucksack.
Protection: rain and sun
Two opposing enemies, and you need to plan for both. Against the rain, a waterproof jacket or a poncho that covers your rucksack too keeps you dry without turning your walk into a sauna - and a poncho has the advantage of going on in two seconds flat, over all your kit. Keep it right at the top of your rucksack, within easy reach without having to empty everything out. Against the sun, at altitude it hits far harder than at sea level, bounced back off rock and snow: high-factor sun cream, category 3 or 4 sunglasses and a hat or cap aren't optional, even under a hazy sky. Sunburn or sunstroke can turn a great day out into a miserable one.
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Navigation and orientation
Don't rely on mobile signal alone - in the mountains, it drops out fast. Bring a map (an IGN paper map or one downloaded offline via an app like IGN Rando or Visorando), a compass if you know how to use one, and a fully charged phone - with a spare battery for longer outings. Make a note of the European emergency number, 112, which works even without your network provider's signal. One last check before you zip up your rucksack: look up the mountain weather forecast, as it determines what clothing and protection you'll need to bring.
Safety: preparing for the unexpected
A compact first aid kit (plasters, antiseptic, bandage, painkillers), a survival blanket that weighs next to nothing, a whistle to signal your position, and a head torch in case the outing runs long: these are the few grams that make all the difference on the day things go wrong. Pack them once at the bottom of your rucksack, and forget about them until the moment they save your day.
That little extra comfort
Once you've got the essentials sorted, a few accessories can really change your walk. Walking poles ease the strain on your knees downhill and give you extra push on the way up — a real bonus once the climb gets steep, and a welcome boost to your balance on unstable ground or when crossing a stream. Foldable, they tuck neatly onto your rucksack when you don't need them. Add something to sit on and stay dry during breaks, a small bag to carry your rubbish back out (we never leave anything behind in the mountains), and a lightweight microfibre towel in case a lake swim comes up along the way.
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La checklist récapitulative
So you don't forget anything when packing your rucksack, here's a summary of the essentials by category. The idea isn't to tick off everything on every trip, but to run through the list and adapt it to your walk: the duration, forecast weather, altitude and how remote the route is will all affect what you need to bring. Keep this table handy before every trip — it soon becomes second nature:
| Category | The essentials to pack |
|---|---|
| Hydration | 1.5 to 2L of water, water bottle or hydration bladder, filter if there's a water source |
| Food | Energy snacks, dried fruit, a proper meal for a full day out |
| Clothing | The 3 layers: breathable, warm (fleece), waterproof |
| Navigation | Map, compass or offline app, charged phone |
| Safety | First aid kit, survival blanket, head torch, whistle |
| Protection | Sun cream, sunglasses, hat, poncho or rain jacket |
Frequently Asked Questions
How much should a day hiking rucksack weigh? Aim for under 10% of your body weight — around 5 to 7kg well distributed for most walkers. Water is the heaviest item, so adjust the amount to suit the route and the heat.
What should you prioritise if you want to travel light? Never skimp on water, your first aid kit, a waterproof layer and a head torch. Everything else can be pared back: freeze-dried meals, lightweight fibre clothing, and only the accessories you really need.
Do you need a first aid kit for a short walk? Yes, always — a compact version is enough. Blisters, cuts and minor aches happen on short outings too, often far from the nearest chemist.
How should you pack your rucksack? Heavy items close to your back and up high, waterproofs and snacks accessible at the top or in the pockets, and the first aid kit always in the same spot. A well-organised rucksack is one you don't have to empty out at every stop.
