The 226ERS Soft Flask is a flexible bottle that reduces in size as you drink to minimize spillage or rebounding of the liquid inside. It is made with BPA-free materials (the body of the bottle is Thermoplastic Polyurethane (TPU) , the stopper is Polypropylene (PP) and the teether is Silica Gel. Its measurements are 24.5 cm high x 6.5 cm wide (including stopper) and it has a mouth diameter of 23 mm inside. Its weight is 33 grams. Format: 500 ml capacity drum. How to use: For its first use it is recommended to rinse with lemon juice (50%) and water (50%). Leave the mixture inside for 2 hours and then rinse with plenty of water.