What are u trying to use them for ??
The reason u ask us because if u don't keep shaking them they won't stay hot ... So your just wasting your $$
Huh??? So he's wasting money just to keep a chameleon alive through the weather?
obvious you didn't read my post.... Please read it again ....
It says the heat packs require you to shake them so they can stay warm ... So after u shake it for 5 mins it will stay hot for less then 10 mins then u have to re shake the bag again .... And again ... And again .. Long story short waste of $$ I try the same thing speaking from experience .....
you must not get the good warmers then LOL i use those for hunting and when i worked and they stay warm for hours without shaking.