Camping is fun but putting up with cold conditions isn’t. The Hot Pocket has you covered. It is an insulated stuff sack that can preheat your sleeping bag and keep it hot. It offers over 12 hours of heat. The device also has a USB-C module that can charge your phone.
The Hot Pocket has a soft fabric and weather resistant design. You can charge it with a solar panel or wall outlet. More information is available here.