1950's Singer electric sewing machine with a comprehensive set of attachments that my late mother left me. I have used it to make seat covers for my 1960's classic motorcycles, such as my 1969 Honda 750 K0.
You could have used a bathroom scale..... eat the 100 bags of chips and subtract your previously measured weight from your final weight, divide by 100 and you have the product weight. then you don't have to take the packaging weight into account.:sick: