I always use coolers , as I don't have any Cambros
Ive used a 30 Qt cooler and a 36 qt cooler with the bluetooth Anova, starting w hot tap water
using bubble shipping wrap cut for the top
Ive never had a problem w long cooks.
Ive also put more packets than one might initially this is ' safe '
just as long as all the packed wiggle a little , and Im careful to give them a stir until the total contents of the
cooler reach equilibrium i.e. the set temp
so little heat is lost , i.e. the outside of the cooker is not even warm
the bluetooth Anova just keeps on chugging and getting the job done