Rightly packing a rucksack is probably one of the most important things to consider while venturing out in the wilderness.
Before you start packing your rucksack, few questions you should ask yourself are, Where are you going? What will be the weather? What is the duration of your tour? Would you be required to carry your rucksack or your bag will be carried on a mule? What items are being provided by your adventure company? (if you have hired one) Would you also carry a dackpack?
Once you have answered all the questions, you are ready to start preparing your stuff for your next big adventure and don’t wait until the night before to start packing — and don’t add last-minute items, those are usually the things that you don’t need!

Pick a quiet corner in your house and lay out everything you think you will need to bring on your trip.

Lay out everything you think you will need to bring and strategise from there.

Dodital and Darwa pass

Look at the amount of clothing you plan to bring, then cut it in half. It’s not a wilderness experience otherwise! When you set out, your backpack should be no more than 75% full. Leave yourself some room — it will make packing the bag before each move much easier!

Pick baselayers that can provide both breathability and warmth. Roll, don’t fold (or better yet, use a compression sack).

Get your big items situated first. Keep weight low and centered.

Organize objects in the way that you know you will need them and then put them inside smaller bags and containers. Preferably the smaller bags will be very soft instead of rigid or shaped, water resistant, and pliable so that you can cram them into your pack.

Look at the amount of clothing you plan to bring, then cut it in half. It’s not a wilderness experience otherwise! Pick baselayers that can provide both breathability and warmth. Roll, don’t fold (or better yet, use a compression sack).

Compression sacks are also your best friend for slimming down puffy items like sleeping bags. Bonus: water protection in case of a downpour.

Deflate your dry food packages with a pin and cover the hole with tape. Put survival items in brain of the pack for fast emergency access.

Attach lighter items to the front of your pack with carabiners, taking care to balance out each side. Use external loops and straps to secure awkwardly shaped items like tent poles and sleeping pads.

Shells and outerwear can be stuffed in the front and side pockets.


Source: http://www.29thdublin.org/wp/cubs/packing-a-rucksack/