Skin-out weight is the total weight of everything you carry and wear on a hike, measured from your skin outward: the backpack and its full contents, plus clothing on your body, boots, trekking poles, a phone or GPS in your pocket, and consumables like food, water, and fuel. It's the number that most accurately reflects what your body actually supports over the course of a hike.
How is skin-out weight different from base weight?
Base weight excludes both consumables and worn or carried items, isolating just the packed gear that doesn't change trip to trip. Skin-out weight includes everything — nothing is excluded. Two hikers with identical base weights can have very different skin-out weights if one wears heavier boots, carries trekking poles, or packs more food for a longer resupply stretch.
Why do some hikers track skin-out weight instead of base weight?
Skin-out weight matters more for understanding total physical load, since your body doesn't distinguish between weight in the pack and weight worn on your feet or carried in your hands — it all adds up to what you're moving over the miles. Base weight is more useful for comparing gear choices between hikers or trips, since it removes variables like food quantity and weather-dependent clothing that aren't really about gear selection.
What typically makes up skin-out weight beyond base weight?
| Category | Examples |
|---|---|
| Worn clothing | Hiking shirt, pants, socks, boots or trail runners |
| Carried items | Trekking poles, phone, sunglasses |
| Consumables | Food, water, fuel |
| Base weight | Pack, shelter, sleep system, cook system, and other packed gear |
Skin-out weight is the sum of all four categories, while base weight is only the last one.
How do you calculate skin-out weight?
Weigh your fully loaded pack, then add the weight of everything you're wearing (clothing and boots) and carrying externally (trekking poles, phone), then add the weight of your food, water, and fuel for that specific day or trip. Because consumables and clothing change trip to trip, skin-out weight isn't a fixed number the way base weight is — it's most useful calculated for a specific day, like your heaviest carry right after a resupply.