You can add any number of additional bags to your reward. £15 for each additional bag without extra postage.
How to add add-ons to your reward?
1. If you’ve already pledged, click the “Manage My Pledge” button at the top of the page. If not, click “Back this project” and pick one of the rewards. Every backer can pick one and only one reward level.
2. Increase your reward. You do not need to add any extra money for shipping.
3. That’s it, you’re done for now.
4. We will double confirm the details with you at the survey time.
We do not offer refunds or returns on bags that were received as a Kickstarter reward. From the Kickstarter FAQ "Kickstarter is not a store and rewards are a thanks for supporting the project". Your pledge means so much and we take it very seriously so that we can build a fantastic product.
Don't see the answer to your question? Ask the project creator directly.