My 10-day mountain packing list fits in a 45L backpack. Everything I need for a Himalayan journey - clothing, sleeping gear, tech, toiletries - goes into one bag that I can carry comfortably for 8 hours a day. Here's the complete list, and the thinking behind every choice.
Clothing - the layering system: 3 merino wool t-shirts (not synthetic - merino doesn't smell after 3 days, which matters when you're sharing a homestay room), 1 mid-weight fleece, 1 packable down jacket (my most versatile piece - worn at camp, on cold mornings, and as a pillow when stuffed in its sack), 1 waterproof rain shell (a real one, not a windbreaker - tested in actual rain), 2 trekking pants (one with zip-off legs), 4 pairs of wool socks, 1 warm hat, 1 sun hat with a brim, 1 pair of lightweight gloves. That's it. I do laundry at homestays.
Footwear: One pair of broken-in trekking boots - not new, not fashionable, broken in over at least 50km before the trip. This is non-negotiable. New boots on a 10-day trek are a recipe for blisters and misery. And a pair of lightweight camp sandals for the evenings. Two pairs total.
Sleeping: A sleeping bag rated to -10°C for high altitude camps, plus a silk liner that adds 5 degrees and keeps the bag clean between washes. The liner is the most underrated piece of gear I own - it weighs 120g, packs to the size of a fist, and extends the life of your sleeping bag by months.
Tech: Headlamp (USB rechargeable - you'll use it every single night), a 20,000mAh power bank, and my phone on airplane mode for the entire trip. No laptop. No tablet. No dedicated camera. The phone camera is more than enough when you're actually present in a place rather than performing your presence.
Toiletries: Biodegradable soap (one bar does body, hair, and laundry), sunscreen SPF 50, lip balm with SPF (your lips will crack above 3,000m if you skip this), and a basic first aid kit - blister plasters, ibuprofen, Diamox for altitude sickness, oral rehydration salts, antiseptic cream, and a small roll of athletic tape.
Food and water: A 1L Nalgene bottle, water purification tablets (backup for when streams are the only source), a handful of energy bars for emergency situations, and electrolyte packets. On Before Maps journeys, all meals are provided - but having emergency food is a habit I'll never break.
What I deliberately leave behind: Extra 'just in case' clothes (you won't need them - I promise), physical books (read on your phone if you must), external speakers (the mountains are the soundtrack), drones (they disturb wildlife, annoy communities, and add 800g to your pack), tripods (too heavy for the value), and any piece of gear whose marketing mentions 'tactical' or 'survival'.
The philosophy behind packing light isn't minimalism for its own sake. It's freedom. A lighter pack means you walk faster, tire slower, and spend less time managing your stuff and more time noticing where you are. When your pack weighs 8kg instead of 15kg, the difference over 8 hours of walking is the difference between arriving exhausted and arriving curious.
One more principle: every item should serve at least two purposes. Your rain shell is also your wind layer. Your buff is also your pillowcase. Your down jacket stuffs into its own pocket to become a camp pillow. The moment you start thinking in dual-purpose terms, half your packing list disappears.
The rule is simple: if you haven't used it by Day 3, you packed wrong.