The market offers a wealth of good vacuum flasks made of stainless steel, but very few of them are completely plastic-free. In most cases, parts of the handle and cup are made of plastic, and the cap is often made entirely of plastic. Apart from a narrow silicone ring, the TKPro vacuum jugs from Klean Kanteen® are completely plastic-free. The American manufacturer has developed a closure made entirely of stainless steel specifically for this purpose; the silicone ring is necessary to ensure a permanent seal. In addition, the wide internal thread TK Closure™ with 360° flow enables pouring in any position of the open closure. Klean Kanteen® manufactures the jug and cup from the usual solid 18/8 stainless steel. Both are double-walled and vacuum-insulated, so the jug keeps its contents warm for up to 28 hours or cool for up to 90 hours. The electropolished surface of the stainless steel inside remains tasteless and is easy to clean. And with its simple, straightforward design, the TKPro vacuum jug also looks good on the desk or dining table.

The Californian family business Klean Kanteen® offers clean alternatives to disposable cups and bottles with its stainless steel containers. What began with a drinking bottle has developed over ten years into a broad repertoire of containers for transporting food, made without aluminum and bisphenol-A (BPA), but from tasteless and odorless stainless steel. Unlike aluminum and plastic, stainless steel is an inert material that neither reacts chemically with food nor releases particles. Containers made from this material are extremely stable and durable, and they also come in a functional and visually appealing design. Klean Kanteen® has the articles manufactured in China and regularly inspects the production facilities there to ensure that Klean Kanteen®'s environmentally friendly standards and working guidelines are adhered to. As a member of "1% for the Planet", Klean Kanteen® donates at least one percent of its sales to environmental protection projects or educational support through non-profit organizations. At the beginning of 2020, the company joined the non-profit organization "Climate Neutral". The aim is to reduce CO₂ emissions to a minimum throughout the company. Even simple measures such as the use of green electricity, video conferencing instead of business trips and reusable solutions in the canteen can help. The first visible step for customers is to do without packaging.

Klean Kanteen® only uses 18/8 stainless steel, and this in a thicker thickness, which makes Klean Kanteen® products significantly more robust than many other stainless steel containers. They can therefore withstand a lot, but are still light enough for use on the go. The threads are also largely made of stainless steel. This contributes to the longevity of the containers. The bottle caps are fitted with silicone seals, which are also used in medical technology.

To ensure that the containers can be used for a long time, they must also be easy to clean. Klean Kanteen® therefore manufactures them with rounded "corners" and smooth, wide threads. On the inside, the surface is electropolished and so smooth that dirt cannot stick easily. And if something does dry on the inside, the wide openings make it easy to reach. Another practical feature is that the stainless steel containers can be cleaned in the dishwasher.