I used it as a waterproof seat, a cover for my pack while I set up my camp, and a dry spot to stand on to change my clothes/shoes/socks...if you have to bug out in wet weather, this is a cheap and easy way to help you stay dry that takes up literally no room in your bag...
While mailing some stuff to my sister this morning, I screwed up on when addressing the tyvek envelope, had a lightbulb moment, and brought the messed up envelope home after I was done in town...
The Priority envelope is 11.625" by 15.125"
I cut the envelope along one long and one short seam, and cut off the closure flap... which yielded a tyvek mouse-tarp about 2 feet by a little more than a foot...
Here you can see the mouse-tarp with one of my boots on it...the tyvek isn't as small as it looks, my boots are fucking enormous...
It folds up to make an incredibly tiny package, smaller in all dimensions than a packet of Lipton Cup-a-soup...
It is important to note that you shouldn't just take tyvek envelopes from the USPS, I took the one I screwed up on as it was going into the garbage otherwise...but I do get them in the mail from time to time...
nfa


