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2. Buy heat shrink tubing that fits snugly over the zipper pulls.
3. Cut the heat shrink to fit and then use a blowdryer on the hot setting until the tubing conforms to the zipper pull.
Thanks very much for the practical advice! This may be just the solution I want.
I still think that it follows from their pejorative statement about their own noisy bag that it is a design (or how we say in the computer world, UX [user experience]) flaw.