You can wash your ziplocs and reuse them. I do not see any real difference between reuse and multiuse in a closed, finite system like a backpack.
The hairband idea is a good one. Or use a rubber band. You never know when a rubber band might come in handy so having one onhand isn't such a bad idea. Otherwise, you could put them into a stuff sack that has something else in it already, or even store them in a pocket of the jacket you wear as you set up your tent, or roll them up in your spare socks.
My ideas aren't very clever, but I favor simplicity whenever possible. Among the things I carry, nothing is quite the shape of the tent stakes so I would have to add something new if I didn't already have a small, silnylon sack that came with an umbrella that I have reused. Now that I've thought up the rolled socks, I may retire the silnylon sack. So thanks for helping me inadvertently!