Opticron Explorer 10x21 Binoculars

I keep them hanging from the wrist strap on my day hikes, and the fact they fold to that tiny 92x65mm size means they disappear into my jacket pocket until I need them.

Pocket-sized is right — they fold down small enough to disappear in my jacket, yet the 10x21 magnification feels surprisingly solid for the size. The wrist strap came in handy during a long walk without a bag, and they're easy to use one-handed.

Took these on a hike and the wrist strap came in handy when I needed both hands to scramble up a rocky section. The image is surprisingly sharp for such a compact size.