Thanks to a new concept dubbed SOAK, we can add sustainable bathhouse to the growing list of potential uses for the durable metal boxes.

The main premise behind SOAK is that it aims to remove some of the guilt which may result from being a regular visitor to resource-heavy spas or bathhouses, by using renewable energy sources and recycled shipping containers.

SOAK looks like it will be pretty well stocked in bathing facilities, with a couple of cold plunge buckets, a shower, and a solarium. It's not clear what the capacity would be (presumably not very high), but a small physical footprint would also make sustainable energy more practicable.