Base weight, and what it is actually for

Base weight is the weight of the things in your pack that stay more or less the same from one trip to the next: shelter, sleep system, the pack itself, cook kit, water treatment, a light. Food, water and fuel are left out because they scale with the trip. The clothes you are wearing are left out because they depend on the weather and on you. There are edge cases, and people enjoy arguing about them, but the idea is not complicated. Strip away everything that changes with the destination and the duration, and what is left is the core of a backpacking setup, as a number you can compare against your last trip, against a friend's kit, or against the same kit after you swap one item.

That is the whole point of it. Base weight is a basis for comparison, and comparison is what makes iteration possible. Change the tent and you can see what it bought you. Add a chair and you know what it cost.

Why I started caring about it

I got into ultralight in college because I wanted to push what I could do. Big days with a pack I barely noticed felt like a kind of freedom, and chasing the number was how I got there. Every ounce I found was miles I could add.

What changed

I am older now, and so is my base weight. I carry more and I walk fewer miles, and I am fine with that. A thicker pad, a tent I can sit up in, sometimes a chair. The trade is comfort for distance, and I make it on purpose.

That is what base weight is for once the chase is over. It lets me make that trade with my eyes open. I know what the chair costs, in ounces and in miles, and I take it anyway. That is a different thing from carrying a heavy pack because I never looked.

How the kits use it

The kits on this site are built on the same definition. Carried gear only, no clothing, because what you wear depends on your size and the weather and no kit page can know either. Trekking poles stay in, because most of the shelters in the ultralight kit pitch with them and leaving the poles out would make the shelter look lighter than it is. Each slot has a short list of gear I would carry, and the kit picks whichever of those is cheapest that day, which is why the total and even the base weight move around. The weights are the manufacturer's numbers for the standard size. Your scale will read a couple of ounces more.

The three tiers are three answers to the same trade. Ultralight is under 10 pounds and asks something of you in care and technique. Lightweight is 10 to 20, where most people who hike regularly end up. Traditional is 20 and up, and it is the right choice more often than the internet admits. Pick the one that matches the trip you actually want to have, and then know what you are carrying.