Product Description: -Brand: No brand -A bisphenol A (BPA) free bottle can prevent you from toxic chemical ingredients as your health is our priority. -Longer durability -User-friendly & convenient. -Made of food grade silica gel, safe and natural well dispose (environmental friendly) -It’s totally odourless and harmless. -Light in weight and portable -Highly recommended for outdoor use -Easy to clean Special highlight: -Leak-proof, tightly sealed airtight lid to prevent watering (Strong sealing). -Come with a hook to allow you to hang on a backpack, bike or belt. -Retractable size, no space, simple stretching and compression, to achieve size changes, easy to carry while not reducing the cup capacity. (REMINDER: AFTER OPENING THE LID, IT CAN BE STRETCHED) -Soft silicone able to reduce the impact when bottles fall on to the hard surface, difficult broken (Not afraid of falling, full of elasticity).