4oz This easy to mix mini milkshake in a bottle is simple to use and fun! Just add milk or water, pour in your sachet and shake! Our PET reusable containers are 100% BPA-free,freezer safe, shatter-proof, and light weight, not as fragile and heavy as glass! Easy to Carry, Suitable for Outdoor and Indoor and perfect for travel, business, work, class, picnic and any gathering.Lightweight and easy to carry, you can hold it in your hand or put it in a backpack, pocket, or purse!