This dehumidifier bag by #MY TO is a great idea because it's reusable and therefore much more environmentally friendly compared to the disposable ones.
It has a water drop indicator which changes from blue to pink when you need to "recharge" it. This can be done in the sun (obviously preferable when possible as it's using no electricity) or in the microwave for 5 minutes. You will need to lower the power on your microwave as it's a maximum of 600 watts.
I use mine in a built in wardrobe because it's attached to an external wall and does suffer from damp, I'm very pleased with it and will be buying another one for another wardrobe.
It can be purchased here: https://www.amazon.co.uk/dehumidifier-silica-gel-MY-eliminates-unpleasant/dp/B01DRAEJ42/ref=redir_mobile_desktop?_encoding=UTF8&psc=1&ref=yo_pop_d_yo_pop_d_pd_t2
Disclaimer: I was sent this item at a discounted cost through #RankBoosterReview #Sponsored