These portable pill bottles with smooth surface are well made and durable enough for serving a long time. Made of quality aluminum alloy, well built, solid, durable, also it's super lightweight, and comes with a nice drawstring pouch, handy for storage and easy for you to carry with when you are on the go. The portable small pill bottle screwed with silicone O-ring seal to make it 100% waterproof, and screw-cap arrangement means it won't open accidentally, handy for daily use, travel and outdoor like hiking, camping, fishing, boating. 2 1/3" L x 3/5" W