I was weighing parts of my cooking kit one day, and realized that the lid of my MSR kettle was pretty heavy in comparison to the pot, wieghing 36 grams (1.27 oz). I decided to make a new lid out of some thick aluminum foil, and the result is a total savings of 29 grams (1 oz)! My new pot lid weighs 7 grams (0.25 oz). I used a piece of nylon cord for the handle. Here's a picture of old and new for comparison:
Here's a picture of the MSR Kettle with it's new lid, weighing a total of 97 grams (3.42 oz).