The 7kg base weight rule exists for good reason - lighter packs mean happier knees and more energy for what matters.
The Big Three
Your pack, sleeping system, and rain gear account for 60% of your weight. Invest in ultralight versions of these items.
Clothing: The 2-3 Rule
2-3 of everything, quick-dry materials only. You'll wash daily. Merino wool is worth the investment.
Cut Ruthlessly
Lay out everything you think you need, then remove half. You don't need a book (use your phone), multiple outfits, or 'just in case' items.
Weigh Everything
Use a kitchen scale. Those 50g items add up quickly. If something weighs more than 200g, question whether you really need it.
Multi-Use Items
Your rain jacket is your wind layer. Your buff is your hat, scarf, and pillow cover. Think creatively.
Ship Ahead or Buy There
Guidebooks, extra layers for cold sections - ship them to pick-up points or buy locally and donate after use.