The Castelli "Fly Team" bottle, which is also used by Team Sky and produced by Elite, has a weight of only 55 g and a capacity of 550 ml. The mouth-friendly, soft, rubberized valve allows high flow while drinking and through the wide opening the bottle can be easily cleaned and filled.
wide opening for easy filling and cleaning
extremely thin wall thickness
mouth-friendly, soft, rubberized valve with high flow rate