I love chips and they are definitely my biggest weakness whenever it comes time for me to start dieting.
But as much as I love 'em, even I have to admit that there are few things grosser than stale chips. So I keep a healthy supply of bag clips and clothespins around; I'm serious about my chip consumption.
But sometimes life gets in the way and you have to improvise. So you roll up the bag and jam it between your toaster and the microwave so it doesn't open, or you slap a rubber band around the bag. Or you could be like this dude and use your significant other's nipple clamps to keep the bag shut.