Umbrella's

[Tarrel]

A bothy is an unlocked agricultural building in Scotland that the landowner makes available for hikers to use as an emergency or overnight shelter.

A "bothy bag", as Midnite says, is a lightweight emergency shelter, made famously by Karrimor. Typically carried by a group leader on hiking expeditions. They weigh next to nothing, take up very little space and can be deployed in an instant. I can say from personal experience that they are superb, and potentially a life-saver. If you're caught out in really poor weather, or just need to stop for a break for some reason, the micro-climate and sense of well-being achieved by getting everyone to sit in one of these things is fantastic.