Silpats are great to use but trying to store the big, flat, floppy liners is a problem. Enter the humble papertowel tube--something you already have and won't cost you a penny. Simply roll the Silpat (short-end to short-end) and they are a perfect fit.
Tip: Roll the Silpat liner as tight as you can to make it easier to put in the tube. Once in the tube it will unroll itself for a tight fit.