Ok.. this is pretty cool. It heated the water I put in it up to 180°f . It's a bit heavy, I might take it on a day hike but wouldn't put it in my Bug Out Bag. There is also a meal size heater as well. I didn't have the cash to drop on it but from the looks of how this performed I think it's got to be good as well. The price is the only turn off for me. At $24.00 for the mug and $9.00 for 5 heaters. It could get pricey. The food heater was around $35.00 and $12.00 for 5 heaters. Handy for an emergency but the price I think can be it's turn off. The weight also is a factor for me.. if your an apartment person, I say grab a few and keep them for just in case. Check them out yourself.