What Size Backpack Do I Need for Travel

For most travelers, a 40-50L backpack works for trips up to 2 weeks, while 50-65L handles 2-8 weeks. Ultralight packers can manage longer trips with 35-40L. Your body size, trip length, and packing style determine the exact size you need.

  1. Measure your torso length. Sit up straight and measure from the base of your neck (C7 vertebra) to the top of your hip bones. This determines frame size: 15-17 inches needs small, 17-20 inches needs medium, 20+ inches needs large.
  2. Calculate by trip length. 1-3 days: 20-30L. 4-7 days: 30-40L. 1-2 weeks: 40-50L. 2-4 weeks: 50-60L. 1-2 months: 60-70L. Longer trips don't need bigger packs—you'll do laundry.
  3. Factor in your packing style. Minimalist packers subtract 10L from the guidelines above. Comfort packers add 10L. If you plan to buy gear on the road or camp frequently, add 15-20L for equipment space.
  4. Test the fit in-store. Load the pack with 15-20 pounds and adjust all straps. Walk around for 10 minutes. The weight should sit on your hips, not shoulders. If the hip belt doesn't align with your hip bones, try a different size.
  5. Consider airline restrictions. Most airlines allow carry-on backpacks up to 22 x 14 x 9 inches. A 40L pack typically fits these dimensions when not overstuffed. Larger packs must be checked, adding $50-100 per flight in fees.
Can I take a 65L backpack as carry-on?
No. Packs over 45L are too large for carry-on dimensions. You'll pay checked bag fees and risk delays if the airline loses your pack.
Should I buy a men's or women's backpack?
Women's packs have shorter torso lengths, narrower shoulder straps, and curved hip belts. Choose based on your body measurements, not gender. Many people find better fits in the 'opposite' gender category.
Is a wheeled backpack worth it?
Only for urban travel on smooth surfaces. Wheeled packs are heavier and the wheels break easily on rough terrain. Stick to traditional backpacks for any outdoor or cobblestone destinations.
How much should a loaded backpack weigh?
No more than 20% of your body weight, ideally 10-15%. A 150-pound person should carry 15-22 pounds maximum. Pack lighter by choosing multi-use items and leaving cotton at home.