UniheatShipping Warmer 40+ Hours (4pack)

I am a new owner to a Uromastyx and I like to prepare for everything. I wanted a heat source to take her to a veterinarian visit. I read the directions and it states it gets to the hottest optimal heat in about 4 hours. So I timed it and woke up early and went ahead and activated it. I wanted it ready and warm when we were at the appointment, not warming up on the way there. I have a plastic shoe box with lid that you get from a dollar store. I put holes in the lid. I pulled off the sticky part and placed one of these on the lid after shaking it up. At the 4 hour mark, it was warm to the touch. But didn't feel super warm. I also had the box wrapped in a towel. On the car ride, I kept my heat on full blast. This did give me peace of mind knowing that there was a heat source at the appointment itself. If I was in an emergency and the power went off, I would worry that this would do the job. It didn't get especially hot at all. I also feel like I would need to use multiple of these if in a true emergency. They are very pricey for what you get. If I didn't need these in my kit, I would not have bought them. However, I am glad that I do have them. Just in case.

i picked these up for moving my snakes across the country in case i need some extra heat for them. they work amazing and are the only ones id recommend

I also didn't need them too. Now I can say I'm disappointed they only stayed warm for about10 hrs of a 12 hrs trip, but my ball python is ok overall. Mine got fairly warm too after about 45mins. Needless to say won't be worried if I need to buy again.

These worked for me. I was traveling with a hibernating bearded dragon in 30-40 degree weather. I was able to check on the heat pad since it was with me. I used 3, unwrapped and shook them a bit, and they all worked for the amount of time they say. When it comes to shipping reptiles though, I don't know, consider using a service? Personally I wouldn't want to risk a five dollar heat pack not working on my baby.

I got these to keep my Crested Gecko's tank warm in case of an extended winter power outage. When a big storm came and knocked out power all over, my apartment got down to 58*F. I had already put in one of these "40+ hour" packs well before that, and it heated the cage just fine without the danger of burning my pet. But I checked it a few hours later, and it was already cold and hard and wet. And my Crestie was a very dark color and unmoving (not dead thankfully.) The tank was so cold. I immediately put in a new one and warmed up the tank, saving my lizard's life, but it only lasted a few hours, again. I will NOT EVER use these for shipping anything!Meanwhile, purely by accident, I was digging in a top cupboard shelf where I keep my power outage supplies and a big bag of 72 hour packs fell out that I'd completely forgotten I'd bought several years earlier. Well, they won't be good anymore, I thought. I opened one up for a test, and it worked just fine - for three days straight! I had coincidentally come down with a cold, and I cuddled up in bed with this other pack even after the power came back on, without burning myself like I do on "hand warmers."You'd think I'd name it as a different brand, but it's the SAME BRAND! What??? Has quality dropped off? Did I get a bad batch? I don't know, but from now on, I'm keeping those old 72 hour packs exclusively for warming my Crestie in winter power outages, and I'll keep these bad 40+ hr packs for when I'm sick. :/

Worked perfectly in shipping between Texas to Michigan in Winter. It took almost a week for the package of plants to get to its destination and was told the pack was still warm.

I had read some people having issues with dead ones when purchasing just one. I hedged my bets and bought the 4 pack. Nice to see the 2 I used started to warm up. I was shipping aquarium plants right after the subzero weather. It took a bit over three days to get there. I used a heavily insulated box (2" thick hard foam with about 14" cube of space for the plants. They arrived "cool" but they all survived. I would not use these on a trip over 40 hours to ship creatures but if you have enough insulation plants can make it. Read the instructions, these take some time to activate. As soon as they were warm to the touch I sealed them in, so I am not sure how hot they got.

These things don’t get very warm and need good air flow to work optimally. And they harden upon activating, presumably blocking air from getting to the center. I constantly broke them up. It worked for me for transporting a gecko by car in sunny weather. I would not rely on them for sensitive reptiles.