By the way, really like your suggestion on putting the batting gloves in zip lock bags. Very good idea, ill try it myself.
I learned this by trial and error. I was tired of my gloves always getting crusty and hard to put on. That's when I noticed the holes would get bigger and the seams would start tearing. Even though it may smell like a dirty foot locker when you open the baggies, it should preserve the leather a lot longer by keeping them moist.
Wet batting gloves in a zip lock bag breeds mold and mildew......both will attack and degrade the leather just as bad and be a health hazard.....let them dry, then lightly put some hand creme on your hands......put on the gloves, then lightly spray a leather conditioner on the gloves..( lexol is a good choice).....rub it in.....gloves stay supple, and not moldy or smelly......
Nothing is more damaging to player (or umpire gear) more than damp storage in a hot locations....