you jest but…you may be under a rock. :)

https://www.gq.com/story/best-fanny-packs

https://datebook.sfchronicle.com/entertainment/covid-times-h...

https://www.outsideonline.com/outdoor-gear/run/fanny-packs-s...

It should be a trend. I've been wearing a crossbody small bag (I guess you could call it a fanny pack, technically) for a long time now and ever since I've gotten a smartwatch I rarely need to take my phone out, so it lives in the bag instead of a bulge in my pants pocket. I wear the bag in the front so when I do need my phone it's just as quick to pull out of the bag as my pants pocket.

Unironically there are bags that I used to associate with drug dealers that are becoming common: https://www.jdsports.co.uk/men/mens-accessories/bags-and-gym...

I wouldn't be surprised if discomfort from having a bulky phone in your pocket drives this.

I am also guilty of buying a bag (not this kind) for my phone because it's so much more comfortable (and makes my trousers last longer) to not have my phone in my pocket.