It is safe to carry around these reusable bottles without spilling liquid thanks to the leak-proof seals. Flat square design makes it easy to store in bags or wherever you need, just like a small book. They are suitable for storing a variety of beverages, juice, smoothies, milk, coffee, liquors, etc. Perfect for trip, picnic, camping, wedding favor, business catering, restaurant service, and any other event. You can label or write names on the beverage bottles so they won't be mistakenly used. The transparent surface is perfect for adding your company's logo to make them stand out.