[starpilot]

The most rugged handheld radio, for rock climbers, whitewater rafters, skiers: https://rockytalkie.com. Just no raspi. I just got a pair and they're incredibly well designed. The rubber case can be removed to make them even lighter. It comes with a full-strength rock climbing carabiner.

[GekkePrutser]

To be honest I've seen a lot radios a lot more rugged than that. Like what the military uses.

Our ham radios are generally only semi-rugged: Waterproof and can take a bit of a fall but nothing like what the military have. Of course those come with a weight penalty too.