The Lightest Flow on Earth.

RED FLUX exists to answer one question: how light can a titanium cup be?

The answer is AIR — 50 grams for a 450ml single-wall cup. Not a prototype. Not a lab test. A real cup you can hold, pack, and drink from. Lighter than an egg. Lighter than any 450ml titanium cup on the market — including Snow Peak.

And THERMO — 100 grams for a 450ml double-wall vacuum cup. While others sell "double-wall" cups that are just air-insulated (they keep you from burning your hand, not your coffee), THERMO is true vacuum. 6 hours. Still ≥65°C. Lighter than Snow Peak's double-wall. Warmer than anything in its weight class.

Two FLOWS. One philosophy. Both made from Grade 1 medical-grade titanium. Both engineered with 0.3mm aerospace-grade sheet metal — unibody spin-formed for AIR, vacuum-brazed for THERMO. Both built in China's Titanium Valley, where 68% of the world's titanium comes from. Both designed with a modular handle system — 4 colors, snap on and off, so one cup becomes three.

This is not a cup. This is a choice.

Weight is a Choice. Warmth is a Choice. Carry Less. Move More. Stay Warm.

RED FLUX. The Lightest Flow on Earth.