Reisparaplu

Took this on a rainy week-long trip and it folded down small enough to disappear into my backpack's side pocket. The collapsible design is genuinely lightweight, so I didn't mind carrying it around all day. Stayed dry the whole time.

I've been keeping this in my car's door pocket and it's saved me twice this week already. It collapses down small enough to fit next to my water bottle, and it's light enough that I forget it's there until I need it.

Tossed this in my backpack for a weekend trip and barely noticed the weight, which is saying something since I usually overpack. It popped open fast when the rain caught us off guard and kept me completely dry walking six blocks. The collapsible handle fits nicely in a side pocket too.