The inside of the bottle is made of 304 stainless steel, while the outside is made of 201 stainless steel.This extra-large vacuum water bottle is perfect for travel, family gatherings, and more. the top cap doubles as a little cup. It can keep your favorite beverages cold for up to 12 hours or hot for up to 10 hours.You can print your brand logo or any content on the outside of the bottle. Measuring 34:oz, this custom extra-large capacity stainless steel vacuum water bottle 34oz 47oz 64oz. Usage Scenarios: Office supplies, school stationery, corporate promotions, trade show giveaways. Customization available: Print your logo or customize packaging and color schemes. Product Highlights: BPA-free, leak-proof, travel-friendly.