I am concerned about what happens if you fall and the contacts get exposed. Battery fire?
Plastic bag should be just a second level of safety.
Pelican case had a good quality and works well.
I am using it with 12s2p and 12s3p without any overheating issues.
Water on battery’s is really a safety issue (fire). In this case you should be able to remove the battery from your waist in time. Water on connector was no real issue for me yet.
150a phase amps is ok. can be less too…

