Condom advice I'd give my younger self
If I could go back in time and give myself advice on buying condoms I'd say this.
#1 - Buy a sampler of various condoms. Try them on. Use them. If it feels like a good fit and it doesn't break, mark down the name and brand.
#2 - Lookup the exact specification of the condom. This is the nominal width (diameter), length, thickness, and material of the condom. Stores don't always publish those details, so you may have to search. I've included my own list of condoms specs here.
#3 - Once you know the specs of the condoms you like, you can start shopping for similar condoms that have the same specs or specs that are close.
Sometimes stores will show specs in inches or millimeters. Sometimes they'll show nominal width and sometimes they'll show circumference. It's confusing, so you can always use the condom size calculators below to show you the size in either circumstance or diameter.