1, 2, 3, 4- PACKS - 20 oz Leak Proof, Reusable Pure Borosilicate Tempered Glass Water Bottle, Non-Slip Silicone Sleeve, 2 Attachments: Loop and Hook, Free of BPA, BPS, BPF, PVC, Phthalates Available in 1-PACK, 2-PACK, 3-PACK and 4-PACK. THE BOTTLE - capacity: 20 oz (600 mL), height with the cap on: 9  inch, weight: 0.5 lb, with stylish outer silicone sleeve and 2 bottle attachments, a loop and a hook, in matching color for 3 versatile bottle uses and looks, designed and tested to be completely leak-proof. The cap is made out of stainless steel. THE PYREX GLASS - made from the non-reactive highest purity borosilicate pyrex glass which does not retain tastes or odors, is super thick and durable. Pyrex glass does not leach any harmful chemicals, carcinogens, endocrine disruptors, toxins, tastes or odors into your beverage as plastics do. Leaching is the process of extracting chemicals from the bottle walls by dissolving them in a liquid inside of the bottle. THE SILICONE SLEEVE - made from the non-reactive food grade silicone which provides a comfortable grip and protection for the bottle. Silicone is inert, stable and does not react with food or beverages. THE CLEANING - completely see-through and without any difficult to clean crevices to ensure complete cleanliness, dishwasher safe for easy cleaning and safe reuse (the bottle, the sleeve, the cap and the attachments go in the dishwasher together). REUSABLE ALTERNATIVE TO PLASTIC BOTTLES - BPA-free, BPS-free, BPF-free, PVC-free, Phthalate-free. NOTE: 1). The bottle attachments (loop and hook) are secured with the cap. Please make sure that the cap is completely screwed on the bottle with the attachment in place before lifting the bottle using the loop or the hook. 2). The stainless steel cap has a silicone ring inside to make it leak-proof. Please contact us for a FREE REPLACEMENT OF THE SILICONE RING if the ring is accidentally lost.