Swiss Engineered Water Bottles. SIGG is the producer of some of the best water bottles for travel…or just daily life. Their bottles are designed to be lightweight, very strong, and are lined with a special coating to make it very easy to clean and safe to reuse. All in all, the perfect water bottle. After that, the company seems to be on a mission to run environmentally unfriendly plastic water bottles out of production. The cost may seem high at first $19-$21, but considering the strong design and your choice of bottle cap, it’s very reasonable.