Maybe you should? (Wear shorts that have pockets).

This is the kind of trade off that people who get really into something make, they don’t put on a pair of running shorts that weigh 2-3 oz. and slip an ID in there, to avoid the extra weight. I get it, I have some hobbies that I’m pretty serious about — but the point of the above EMT’s post is to think through what would happen in the event of the worst. If I got hit by a bus, whether or not I was dead, I’d want someone to be able to call my mom pretty fast. That’s hard when you’re optimizing for the version of the experience where everything goes well.

One thing I recommend is getting an extra disposable ID to carry while biking or running. It would be a pain to replace my driver’s license but my NYC ID is just a matter of filling out a form online.

Cyclist here. Sibling comments are suggesting to wear shorts with pockets. That's a big nope for me; anything there will be an annoyance at best, or worse, cause chafing.

Cycling jerseys have pockets in back on the waist, which aren't annoying and, bonus, are accessible while pedaling. Another alternative is a fanny pack -- as long as you don't overload it, it can be quite convenient

Former cyclist. I used an old leather business card case to keep ID, a credit card, and some cash in one of my back jersey pockets. These days I'd look at some of the small aluminum cases that are for a similar purpose. My only cycling shorts that had pockets were for casual mountain biking.

You ought to consider wearing shorts with pockets, then. Personally, as someone who spends at least half of every year traveling the world by bicycle, I find full-length expedition trousers like the Fjällräven Abisko to be the best clothing option. They are durable enough to withstand all the wear and tear of cycling all day and then walking through the bush to set up a campsite at day’s end. Plus they just protect you from the sun – wearing shorts while cycle-touring is way too much UV exposure.