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A bag that will retain heat needs to be a good insulator of heat. Clear poly bags aren't good enough at insulating heat to keep food hot for very long.
It depends where you are using it and the temperature. The pack should not exceed 100 degrees Fahrenheit and I would avoid putting the pack around your abdominal area.
Yes- that is what the poly-choke is for.
Being an in line you should have no trouble with pellets.
There is none, only use pellets designed specifically for paintball.
Both types (hot and cold) of packs can be easily transported and used in travel. They do not take up a lot of room in a bag or box. If someone were to get hurt, a cold pack can quickly be used to help them. The same goes with a hot pack.
No you should not do either. If you experience any pain from a hernia you should seek medical attention immediately.
Not all BB guns are designed to use pellets. They are only designed to use BBs. Some models however are designed to use both BB's and Pellets. Pellets are harder hitting and will do more damage.
poly- is a prefix that basically means multiple.ex.I am not polytheistic now i am monotheistic.Polygon: Multiple cornersPolyphonic: Of multiple voicesNote that you should never use poly alone as a word, it should always be a prefix.
Platinum because it makes the water more dense for quick-freeze
There are heating pellets and food grade pellets. Only use food grade pellets in a grill/smoker. heating pellets used in a grill/smoker are a health problem.