- Stainless steel BB 350ml- Keep your coffee hot for up to 5 hours with the Smash Blue Stainless Steel Barista Buddy 350ml! Both sustainable and leak proof, this reusable cup is made for your coffee, tea, or hot chocolate. Perfect for the work commute, this will soon be your best reusable coffee cup!. Keeps drinks hot up to 5 hours. Made from Dual Wall Vacuum Insulated Stainless Steel 100% leak proof twist lock lid 3 part lid design disassembles for easy cleaning