It varies by capacity and model. A compact coffee mug will keep your coffee hot for a few hours. Larger thermos flasks or jugs often keep cold drinks cool all day. The fuller the bottle and the less you open it, the better the insulation works. Extra tip: for cold drinks, a simple cooling element helps keep it fresh even longer.

Most stainless steel thermos bottles with a screw cap are completely leak-proof. Still, we recommend not to throw bottles loose in your bag. This is because movement can loosen the cap. Rather, put your bottle in a side pocket or holder. Coffee cups with an open drinking hole (like a Travel Cup or Basic Mug) are not leak-proof, so use them upright: at your desk, in the train or in the car holder. Looking for a cup that really has to go in your bag? Then go for a model with a cap or snap-on lid.

Hand washing extends the life of your bottle. Use warm water and mild soap, and let everything dry thoroughly open. Some models are allowed on low temperature in the dishwasher, such as the Bio Premium Cup or Click&Go. Tea strainers and parts with bamboo? Rather not put those in the dishwasher, just rinse by hand.

Our thermos bottles are made of double-walled stainless steel (SS), sometimes with bamboo accents. Some coffee mugs are made from biobased material from residual sugar cane streams. Everything is BPA-free, toxic-free and completely food-safe. And nice touch: Stainless steel doesn't take on odor or taste. So your coffee, tea, water or soup always tastes pure.

For your daily cappuccino, a 250-300 ml coffee mug is ideal. A 400-500 ml thermos is handy on the go or while exercising. And are you going hiking or want to share? Then a 750 ml to 1 liter bottle or jug is perfect. Whatever you choose: you save plastic and support our mission against disposable waste. Every purchase helps water donations and projects such as Trash Barriers through Club Kakatua.

Pay attention to the material (such as stainless steel or biobased plastic), whether the bottle is reusable, and what the brand does about environmental impact. At Retulp you choose products without BPA, made from sustainable materials. Plus: you support projects that keep plastic out of nature and provide clean drinking water elsewhere.

Yes, almost all hot and cold drinks can go into a stainless steel thermos. Think coffee, tea, soup or water. We do not recommend carbonated drinks - they can build up pressure and cause leakage or cap damage. Do you use the bottle for different drinks? If so, rinse it thoroughly in between uses.

At Retulp you not only buy a beautiful and practical product, but you also directly contribute to less plastic waste and more access to clean drinking water. For every bottle sold, we donate 1000 times its content to water projects and you help build barriers against plastic pollution. That's a small effort with a big impact.

No, that's the big advantage of our double-walled vacuum insulation. The heat stays inside the bottle and does not migrate to the outside. So you can safely hold the bottle without burning your hands, even when it holds boiling hot tea or coffee.

Absolutely. Several models in our collection (such as the Tumbler) come standard with a handy removable tea filter or strainer. This allows you to add fresh tea leaves, mint, ginger or pieces of fruit directly into the bottle without ingesting them while drinking. It makes the bottle more versatile than just for water or coffee.

No, this too is prevented by the double-walled construction. Because the temperature of the drink does not come into contact with the outside temperature, condensation does not deposit on the outside of the bottle. So you can feel free to put your ice-cold water bottle next to your laptop or papers in your bag; everything stays bone dry.

Stainless steel is an incredibly strong and durable material that doesn't break like glass. If you drop the bottle, it might get dented or have some paint damaged (we call that "character"), but in most cases the bottle remains usable and leak-proof. So it is a very 'hufterproof' choice for daily use, sports and school.