Ultralight pack builder + gear database
The pack list that already knows what your gear weighs.
Pick gear from a catalog of maker-checked weights. Watch your base weight move as you add, swap and compare. No typing in ounces by hand.
Start with the big three
Pack, shelter and sleep system decide most of your base weight. The pick shown is the one buyers rate highest.
Ranked lists
Guides →The lightest, best-rated gear in each category, ranked by checked weight and reviews.
Everything else
Start from a kit
Complete loadouts built from the catalog. Copy one into My Pack, then swap in what you already own.
Field guides
All guides →
Guide · 5 min
What Is Base Weight?
The one number that defines an ultralight kit — and how to lower yours.
Guide · 6 min
The Big 3
Pack, shelter, and sleep — where ultralight is won or lost.
Guide · 7 min
Your First Sub-10-lb Kit
A complete beginner kit, system by system, with real gear.
Best of
Best-of gear lists
Tents, quilts, packs and more — ranked by real weight and price.