Practice using Stealthy Heat to see which option(s) work best for you.
(Results may vary)
Option #1 - No Pouch
[Quick heating with very long temperature retention time and the most effective concealment method.]
Option #2 - With Pouch
[Quick heating with very long temperature retention; container more secure than Option #1, but slightly more bulky to conceal.]
Option #3 [Practice your own variations with Stealthy Heat Kit (pouch, strap, rapid heaters), different types of disposable warmers, and different types of liquids to see what works best for your situation's temperature retention and concealment needs.]