You may already know that Outdoor Herbivore is against the use of heating foods inside of soft plastic. It doesn’t align with our view of producing backpacking food made from high quality, organic ingredients, and subsequently urging hikers to pour boiling water inside a plastic bag to reconstitute it. This is why we do not sell our food in stand-up cook pouches.
But cooking liners are rated for much higher temperatures (up to 400 degrees F), so does that make them safer for hot food?
Out of curiosity, we decided to look at the feasibility of using cooking liners as an alternative to reconstituting hot foods in cooking pouches.
Cooking bags, or pot liners, are essentially a smaller version of a “turkey” bag, such as those designed to trap moisture while cooking a turkey inside of an oven. The only difference is that the cooking bag liners are sized to fit inside of a round pot so that foods can be boiled and simmered inside. Because the liner eliminates food-to-metal contact, it prevents sticking and keeps your dish clean.
Cooking bags are made of high-temperature synthetic plastic polymers (PET or nylon), which are thin and flexible. The bags, while extremely thin (about 1 millimeter), are made from the same material to withstand cooking for several hours inside of a hot oven.
You insert the bag inside of your cooking pot so that it nests inside of your pot while you boil water and cook/reconstitute dried meals. Since food never makes contact with the metal wall of your pot, it eliminates any food particles from sticking there. While you don’t have to worry about cleaning your pot, you will have to carry the dirty liner until you can find a trash receptacle to dispose of it properly.
Here is a video showing cooking bags in action with a backpacking stove:
Pot liners can be an alternative for backpackers who like the convenience of cook pouches or freezer bag cooking. The added advantage of using a liner is that you can eat directly from your pot, which likely has a wider opening than a rectangular shaped pouch/freezer bag. Besides giving you more space to dig in and eat, the bowl shape makes it easier to scoop out every last drop, eliminating food from getting caught in a corner. Otherwise, the advantages of a liner are similar to a pouch –
Unique advantage and disadvantages of cooking liners over traditional plastic backpacking food pouches rated for boiling water.
Until cooking bags are suited for direct heat, we don’t think a 60% failure rate is a good investment for avoiding dishes. Some manufacturers suggest adding water to the pot before placing the liner inside, which can protect it from the melting created by hot spots that may develop from direct heat. We did not try this extra step. Another suggestion is to not use the liner for boiling water/cooking, but only for hydrating the food. At some point, you have to ask yourself if the extra expense is worth the perceived benefits. For us, liners created an additional hassle.
Cooking liners come in various sizes. The smallest standard size is a 2 Qt round liner (9″ x 14″), which is large enough to fit major backpacking cook pots, ranging from 1 – 2 L in size, including the common brands such as, GSI, SnowPeak, MSR, and JetBoil.
The cost for an individual pot liner ranges from $.12 – $.40.
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Seems highly artificial---If I'm backpacking I like cooking in a pot and perhaps cleaning it with sand and a little water---not difficult.
"At some point, you have to ask yourself if the extra expense is worth the perceived benefits." My thoughts are NO! An aversion to cleaning justifies trashing the earth with more plastic AND risking your own health? The cook bag manufacturers state they're free of BPA, so they must be safe! Well, BPA was never in soft plastic/food bags to begin with! The problem is beyond BPA. It is the toxins in plasticizers and other chemical additives that are added to bags to make them pliable. We know BPA causes estrogen activity and is bad. What else is causes harm? We haven’t even scratched the surface of what the other chemicals are capable of.