What is Reddit's opinion of
"Hot Hand Warmers 11 Hours Long Lasting - 40 Count - Natural Odorless Safe Single Use Air Activated Heat Packs for Hands, Toes and Body - Up to 11 Hours of Heat - TSA Approved"
1 comment of this product found across Reddit:
Those are expensive for their size. If you want an air activated warmer then hand warmer packs are the better, cheaper option.