Sadly this bag too, like it's potato bag sibling went mouldy in my cupboard. It did keep my onions fresh for longer, but the mould made it unusable in the end. Maybe a black-out box or pot would be a better solution as mould does not attach to a solid smooth surface.
support_agent A note from the team
I'm sorry that the onion preserving bag had not worked as well as expected. I'll be in touch shortly.