and the built-in compass is a good helper in an emergency. Drink purified water outdoors with this filtered water bottle. Features: [EXCELLENT PURIFICATION FUNCTION] Equipped with filter made of hollow fiber membrane, activated carbon, ion exchange resin and silver ion ball. It allows you to purify water from river, lake, pond or other freshwater resources when there is no drinkable water. [LARGE CAPACITY] This water bottle boasts large capacity (with filter: 650ml, without filter: 780ml), which is ideal for fitness, camping, hiking and other outdoor activities. [SELECTED MATERIAL] Designed with BPA free tritan bottle, food-grade PP lid and food-grade silicone straw, it is safe, heat-resistant, shatterproof, lightweight, dishwasher safe and durable. [LOCKABLE LID & COMPASS] The lockable bottle lid with handle greatly prevents water from spilling and ensures convenient carrying, and the built-in compass serves as a good helper in an emergency. You can also hang it on the backpack thanks to the attached carabiner. [FILTER OR NORMAL STRAW] This water bottle comes with both filter and normal straw for different situations. Use the normal straw for daily drinking or install the filter to purify water as needed. [WIDE USAGE SCENARIOS] It is suitable for both indoors and outdoors, and could be an exquisite and practical gift for outdoor enthusiasts. Specifications: -Item Name: Water bottle -Material: Tritan/ PP/ Silicone -Color: Black/ Blue/ Green (optional) -Size: 23.5*7.8cm/ 9.25*3.07in -G.W.: 300g/ 10.58oz Package List: 1* Water bottle Notes: 1. Size information is just for reference only, please allow 1-2cm (0.4-0.8") differences due to manual measurement, thanks. 2. Item color displayed in photos may be showing slightly different on your monitor since monitors are not calibrated the same.