I carry my lunch box to college, as eating in canteen is not good health-wise, plus I wouldn't want to waste my pocket money on canteen food! 

So, when my mother gives me Parathas (sort of an Indian bread), sandwiches, or anything similar, ketchup is must. Instead of pouring ketchup in a small tiffin, I carry these packets. They are useful, quite useful!

I also collect other stuff from stores like McDonald's, Pizza Huts and Cafe Coffee Day. The stuff mostly includes Tissues, Ketchup Packets, Oregano, Chilly Flakes and Sugar Packets, (crazy, isn't it?). 

What things do you collect in order to use them later?