I noticed on my last trip, when I pulled my bag off the belt, part of the zipper had become separated and the bag was open. Can I fix this and just reinforce my luggage with some straps, or should I buy a new luggage? To be fair, my luggage is "Tag" brand and I'm pretty sure it was cheap and I've probably owned it for like a decade. But since I don't travel that much, I wonder if new luggage is really necessary. Thanks!