YETI Rambler 20 oz Tumbler Stainless Steel — Firefly Yellow Duracoat, Vacuum Insulated with MagSlider Lid

The YETI Rambler 20 oz Tumbler is a durable stainless-steel mug with double-wall vacuum insulation and a magnetic MagSlider lid designed to keep drinks hot or cold while resisting dents and fading.

Built for people who move fast and want temperature performance they can count on, this 20 oz Rambler combines rugged construction with a comfortable shape that fits most cup holders. The Firefly Yellow Duracoat finish gives the tumbler a bright, long-lasting color that resists chipping and fading, while the No Sweat Design prevents condensation. It’s dishwasher-safe and BPA-free for easy care and everyday use.

How well does it keep drinks hot or cold?

The double-wall vacuum insulation slows heat transfer so cold drinks stay cold and hot beverages stay warmer than single-wall cups. It’s engineered to reduce temperature loss through conduction and convection without using added insulation materials that can degrade over time.

• Double-wall vacuum seal for extended temperature retention.
• Stainless-steel construction minimizes flavor transfer and odors.
• MagSlider lid helps reduce heat or cold escape during sipping.

Is the MagSlider lid leakproof and easy to use?

The MagSlider lid uses a magnetic slider to secure the sipping opening and reduce spills, but it is not fully leakproof—tilting or dropping can still cause spills. The magnet-acted slider is simple to open and close with one hand, making it convenient while driving or on the move.

• Magnetic slider provides stable coverage for the drinking hole.
• Designed for quick access while retaining temperature.
• Not guaranteed leakproof—avoid tossing in sealed bags with liquid inside.

How durable is the finish and how do I care for the tumbler?

YETI’s Duracoat finish on the Firefly Yellow tumbler resists cracking, peeling, and fading under regular use. The stainless-steel shell is tough against dents and scratches; routine cleaning is easy because the Rambler is dishwasher-safe and BPA-free.

• Duracoat finish preserves color through outdoor use and washing.
• Dishwasher safe for convenient cleanup; handwashing recommended for longest lid life.
• No Sweat Design keeps hands and surfaces dry from condensation.

Will this travel with me—size and cup holder fit?

The 20 oz Rambler measures approximately 6 7/8 inches tall with a 3 1/2 inch lip diameter, dimensions chosen to fit most standard vehicle cup holders and backpack pockets. Its size balances generous liquid capacity with portable convenience for commuting, road trips, or daily routines.

• Height: about 6 7/8 inches; lip diameter: 3 1/2 inches.
• Sized to fit standard car cup holders and many travel accessories.
• Compact enough for desk use and tall enough for longer pours.

Who is this for: The YETI Rambler 20 oz in Firefly Yellow is aimed at commuters, outdoor enthusiasts, and anyone who wants a sturdy, bright-colored tumbler that maintains drink temperatures and resists wear. Choose this Rambler if you need a reliable daily cup that fits cup holders, stands up to rough handling, and offers easy one-handed sipping with the MagSlider lid.