Pocket Blanket™

Tossed this in my daypack for a hike and ended up using it at a trailside lunch spot with damp grass. The size is genuinely small enough to forget it's in there, and it kept my jeans dry the whole time.

Folded down smaller than my phone, so it actually lives in my jacket pocket instead of getting left at home. Used it for a trailside lunch on damp grass and stayed completely dry. The corner stakes are a nice touch on windy days.

Took this to an outdoor concert last weekend and it fit right in my back pocket until we found a spot. Folding it back up took maybe a minute, and the ground underneath was damp but I stayed completely dry the whole set.