What are the pros and cons of real cork versus alternative materials for bottle toppers, and which suppliers do members use?

Members use a mix of real cork and alternatives, with most emphasizing that quality and supplier choice matter significantly.

**Real cork:** - **Berlin Packaging** — supplies agglomerated cork toppers; members report occasional bad batches but generally acceptable quality - **Rankin** — supplies sustainably managed, higher-quality cork; laser-etched wood options available; described as reliable with very few problems when you "pay for good cork" - Quality varies: some members experienced frequent breakage and frustration with cheaper cork; investing in better-grade cork reduces problems

**Alternative materials:** - Some members have moved away from real cork to mechanically-applied alternatives (specific material not detailed in discussion) - Mechanically applied toppers appear to address breakage issues members experienced with real cork

**Cap suppliers:** - **Bostocap** — mentioned as a contact for simple GPI metal caps

**Key takeaway:** The difference between problem cork and reliable cork is often about paying for quality and choosing a reputable supplier. Members who invested in sustainably managed, higher-grade cork reported fewer issues.