Desis love to retain the tags long after they complete their travel. In fact, most of them retain them till they check-in their luggage next time. This love for tags only gets persistent if they are visiting in India or if they are back in India after an official trip. As a rule, backpack travel tags remain forever. The hope is friends/family/co-workers or fellow passengers in Indian trains are bound to notice the tags and think high of them.
NRI Desis too, love to retain tags to brag about how long its been since they last visited India.
Finally, it’s the desi way of reconciling with the fact that airlines ripped them off and thus retaining the tags is one way to maximize the ROI from the expensive trip they made.