Seacoast glass bottles offer you a clean, eco-friendly alternative to plastic, no odours or residue is left behind from any juices or cooking liquids you store in these bottles, when left to dry properly.Allowing you to prepare, and conveniently store for later use! You don't ever have to use cheap plastic water bottles for you found a great long term replacement, with Seacoast glass bottles you can refill and reuse the bottle for life, no more running to the store to buy water bottles.With six bottles you won't need to constantly refill the bottles.They are easy and convenient for travel and fits nicely in a standard size cup holder in your car.We don't recommend any drastic change in temperature, as glass can shatter if heated rapidly.Placing the bottle in the freezer with liquid for long periods of time isn't either recommended, as liquid expands and can cause the glass to break.Cap is made with 18/10 stainless steel with Silicone gasket for airtight seal, seal prevents any plastic in the cap to come in contact with the liquid.****Wash items thoroughly before use****