Many people have several liners for their instant pot, especially if you use it a lot and need to start prepping for the next recipe before the first one is done or if you want your meal (or chicken soup in this case) to cool in the pot but need to carry on and use the instant pot again. I also specify in Step 1 to place all the veggies in the liner (rather than the POT) because you need to bring the liner to the tap to fill it with water and you don't want to fill it with the line already in place, you could get water inside the pot itself.