Do you re-use the little sachets of silica that come in shoeboxes, etc

I do- I am currently doing a huge purge, clean and organize project throughout the house. There's a whole lotta totes and freezer bags goin' on. That can mean mould,moisture and mildew if you're not careful. The silica is what's often used to dry flowers,so it really does the job.You can write the date on each packet as you use it, and discard it after awhile. You can also go to stores like Walmart, shoe stores, decorating stores (mine all come from Wicker Emporium,my brother works there) and ask them to keep them for you if you need a lot. Otherwise the ones that come with your occasional purchases should suffice.Please let me know what you think of this re-use idea.