If you're using the lip balm just for yourself, I don't see a problem with reusing tubes. However, I'm making these to sell so I use new tubes only. Even though I've been making lip balm for a long time (close to 20 years), I've never considered selling it. I'm really happy with my recipe (it's the only lip balm my daughter uses) and I think it's time to share the goodness.This is on my to-do list for the near future, but I have not started looking into it yet. I imagine there will be a thread or forum area on that here somewhere? Can I re-use store bought tubes or do I have to buy new ones? I feel as you do -- I want to make as much of my own care products as possible!