Plastic Sleeve for Vaccine Booklet in Wallet

Plastic Sleeve for Vaccine Booklet in Wallet sounds like a micro-optimization until you are on a Didi ride through rain that turns Chengdu traffic into performance art.

A student I met at a language exchange once ordered 'medium' spice and cried politely in front of coworkers. The fix took less time than telling the story.

Try this once: write the rule on your phone lock screen for three days. If it survives, it is yours.

Works for me in Chengdu humidity.