in a humid environment i wouldnt leave the bag open
if i live in humid place i would buy those plastic boxes
where you will get a device to suck all the air out of the box so that it will creates an vacuum
and once in the month i would let all the air out from the box and open the lid so that they can breath for a couple of hours
thats how some of the sneaker peeps in hong kong store their shoes since they also suffers a lot from humidity
That's insane. But if i had the dough i'd definitely get a humidity controlled room for my sneakers. Humidity here in Singapore is almost a constant 60-70%. lol
I know some people clear-wrap their sneakers, but i wear every single pair of mine that isn't very viable.