Every tumbler is visually inspected and leak tested before dispatch. While we take every precaution to ensure quality, double-wall tumblers can occasionally develop leaks due to manufacturing variations that may not be immediately visible.

To protect your crafting materials, we strongly recommend performing a simple water test before filling your tumbler with glitter, pigments, or your chosen liquid solution. Testing with distilled water first can help identify any issues and prevent unnecessary waste of supplies.

Please note that, as with all double-wall tumblers, a small risk of leakage remains despite prior testing.