Riding Birmingham area in the mid/late 80's I used to carry a small hammock in my backpack. Bundled up it was about the size of a softball-AND it doubled as a tow rope etc.
I always made it a point to find a cool spot-string it up-kick back in it-if only for a few minutes....just because.
This is one of the main reasons I started riding-bikes got me places no other way could.