A preliminary search reveals that this question has been asked before. However, none of the answers were very helpful, and they are all at least 2-3 years old. So here goes again...

Is there any company providing self storage/mini storage in Kunming? Does such a thing even exist in China?

I'd have maybe a couple of cubic meters of stuff—clothes, books, kitchen stuff—plus a bike to store. No furniture.

A quick Chinese search on baidu and I seem to have answered my own question. I'll post what I found here in case anyone else is looking for the same service. I'll go ahead and keep this post up, in case anyone out there has any experience with this in Kunming, or has heard of this company I found and has any feedback to give. By the way, the Chinese word for "mini storage" is 迷你仓:

Website I found (haven't called yet to verify)
km.58.com/jiajuhuanbao/9569450533638x.shtml

i know it's been a few years but did you have any luck find 迷你仓 ?