Premium Material: Our stainless steel drinking cups are made from 304 stainless steel, making them durable, drop-resistant, corrosion-resistant, odorless, lightweight, easy to clean, and reusable. The round rim design of this foldable camping mug perfectly fits the shape of your lips, ensuring a safe and comfortable drinking experience. Sizes and Quantities: You will receive two different sizes (small and medium) of portable foldable mugs. The small stainless steel drinking cup is 65 mm high, with a rim diameter of 47 mm, a base diameter of 50 mm, and a capacity of 75 ml; the medium foldable camping mug is 75 mm high, with a rim diameter of 60 mm, a base diameter of 65 mm, and a capacity of 150 ml. Easy to Use: After opening the lid, rotate the collapsible layer in one direction to extend the portable foldable mug to its maximum height and secure it. After drinking, simply rotate it in the opposite direction to store it. It's simple and practical (be sure to tighten it during use to prevent burns from sudden collapse). Foldable Design: This portable telescopic travel mug features a foldable design, making it compact and lightweight, easily fitting into a pocket or handbag. Additionally, this stainless steel travel mug comes with a keychain, which can be attached to a belt, backpack, or jacket. Easy to Carry: The stainless steel travel mug folds down to a compact size, perfect for fitting into a bag, purse, backpack, or suitcase, making your travels more convenient. Clip-on Design: This foldable stainless steel mug comes with a keychain, allowing you to attach it to your backpack for easy transport, freeing up your hands and eliminating the worry of losing it. Versatile: Our portable foldable travel mug is ideal for outdoor activities and everyday use. It can hold water, tea, juice, or carbonated drinks. It is also an ideal companion for camping, hiking, mountaineering, and other outdoor activities.