A bamboo flask is a type of insulated beverage container, typically made with a stainless steel interior and a bamboo exterior. These flasks are designed to keep drinks hot or cold for extended periods due to their double-walled insulation. They often feature a leak-proof lid and may include a removable tea strainer for loose leaf tea or fruit infusions. Bamboo flasks are popular for their eco-friendly design and natural aesthetic, making them a stylish and sustainable alternative to plastic bottles