回收鋼製保溫瓶，炭黑色

Took it on a weekend hike and the water was still icy cold Monday morning when I cracked it open at work. The recycled steel body feels solid and the matte charcoal finish hasn't picked up a single scratch yet.

Used it all week at my desk and forgot it was even there until I reached for a hot coffee at 3pm– still steaming after nine hours. The recycled steel feels solid in the hand, no weird metallic taste either. Cold water stayed icy overnight in the car, so the 48-hour claim seems legit so far.

Took it on a weekend camping trip and the coffee was still steaming at sunrise the next day—20 hours warm is no joke. The recycled steel body feels solid and the matte charcoal finish hides scratches well.