"RichToyBox" writes:

The bags will be fine as Ingrid said, but due to the number of fish, I would
use oxygen instead of just air. I use welding oxygen to fill my bags to
transport my koi, even if it is for a short 15 minute trip. You never know
when something will cause a traffic shutdown.

Good thinking. Or maybe carry a bottle of hydrogen peroxide for emergency O2
if you don't have bottled oxygen.