While I was reading The Life-Changing Magic of Tidying Up by Marie Kondo, I was frequently reminded of ideas from ultralight backpacking. And as I follow various discussions of the ‘KonMari’ method online (and offline – no, I didn’t bring it up, other people mentioned it first), a lot of it sounds very similar to the various (and eventually repetitive) discussions around ultralight backpacking.
Here is a quick overview of ultralight backpacking: carrying weight on a long journey on foot, especially if it involves mountains / rough terrain / stream crossings / etc. really sucks. It takes more energy, it makes bodies feel more sore, it reduces mobility/nimbleness, it reduces speed, and generally, nobody wants to carry weight. However, people who are going to spend multiple nights on a trail need to carry some things, such as food, something to keep them warm while they sleep, etc. and since these things generally will not fit into pockets, one needs a backpack to carry these things. In short, weight increases the physical costs of backpacking, and generally people want to only carry things which bring enough value to justify the physical cost.
(Bulk also imposes a cost by taking up more space in a pack, but backpackers are generally more interested in reducing weight than bulk, especially since bulk and weight are often correlated.)
The ‘ultralight’ movement in backpacking got started in the 1990s – the beginning of the movement is often attributed to Ray Jardine. It was possible to reduce the weight of backpacking gear partially because of technological advances, but the main change is that backpackers asked what was really necessary or only being used due to outdoor cultural conventions, and then they systematically went through their gear, asking themselves whether or not they needed everything, whether a lighter thing could serve the same function, and so forth.