Hans Larsen Double Walled Vacuum Insulated Water Bottle is part of the CHANGE Collection, and as a result, contributes to Water.org – a global NGO that provides millions with access to safe water and sanitation. By giving to Water.org, you are giving a GIFT THAT GIVES BACK. Hunfeld is double walled with SS304 grade stainless steel on the inside and on outside, leakproof, stainless steel reusable water bottle with 8 hours hot, and 24 hours cold storage. Content: 500ml