This vaccum bottle is made of quality double walled stainless steel material, sturdy and durable. It comes with a leak proof, insulated, BPA and Phthalates free cap. The top water bottle about 17oz(500ml), and the bottom is removable and can be used as a storage box 8oz(250ml), you can put in small change, headphones, cards, etc. Perfect for daily use and can be taken to anywhere – hiking, biking, beach, camping, gym, school or company! Put it in your gym bag or the side pouch of your backpack. Measuring 26oz, this custom double-layer 26oz stainless steel thermos bottle with hidden storage bottom. Usage Scenarios: Office supplies, school stationery, corporate promotions, trade show giveaways. Tailored branding: Supports logo imprint and design personalization. Product Highlights: BPA-free, leak-proof, travel-friendly.