IRON °FLASK 40 oz Co-Pilot Insulated Travel Mug — Vacuum Double-Wall, Fits Cup Holders, Two Interchangeable Lids

The IRON °FLASK 40 oz Co-Pilot is a double-walled, vacuum-insulated travel mug designed to keep drinks cold up to 20 hours and hot up to 5 hours while fitting standard cup holders.

This 40 oz Co-Pilot insulated travel mug from IRON °FLASK blends large-capacity hydration with a compact, travel-friendly shape. Constructed from 18/8 stainless steel and offered with two interchangeable lids, it aims to suit commute routines, road trips, gym sessions, and desk use. The design focuses on temperature retention, durability, and easy cleaning so you get dependable performance without fuss.

How long will beverages stay cold or hot in this Co-Pilot mug?

The Co-Pilot uses double-walled vacuum insulation to slow temperature transfer. Expect icy drinks to remain cold for up to 20 hours and hot beverages to stay warm for up to 5 hours under typical conditions.

• Cold retention: up to 20 hours for water, iced coffee, or cold brew
• Hot retention: up to 5 hours for coffee, tea, or hot chocolate
• Double-walled stainless steel prevents exterior condensation
• Maintains flavor without metallic aftertaste thanks to 18/8 stainless steel

Will this 40 oz mug fit in my car cup holder and stay secure?

The Co-Pilot is shaped to fit most standard cup holders and features a rubber base that reduces slipping and rattling. Its tapered profile and compact footprint make it ideal for drivers and passengers who need a stable drink container on the go.

• Slim, tapered body designed for standard cup holders
• Rubber bottom for non-slip, noise-dampening contact
• Lightweight build reduces tipping risk while driving
• Two lids provide options for secure transport or easy sipping

What lids are included and which situations are they best for?

This model includes two separate lids: a splash-proof straw lid for cold drinks and a leak-resistant flip lid for hot and active use. Swap lids depending on whether you want quick sips, spill protection, or better heat retention.

• Splash-proof straw lid: great for iced drinks, hydration while moving
• Leak-proof flip lid: better for hot drinks and preventing spills in transit
• Both lids form tight seals to minimize leaks and splashes
• Interchangeable design lets you customize based on activity

How easy is the Co-Pilot to clean and maintain?

The mug’s wide mouth and smooth stainless interior simplify hand washing, letting you reach all surfaces without specialty brushes. While hand washing is recommended for longevity, the wide opening also makes rinsing and drying quick.

• Wide mouth allows full access for sponge or brush cleaning
• 18/8 stainless steel interior resists stains and odors
• Removable lids disassemble for thorough cleaning
• Avoids lingering residue for reliable daily hygiene

Who is this for: The IRON °FLASK 40 oz Co-Pilot suits people who want a high-capacity travel mug that still fits cup holders — commuters, road-trippers, gym-goers, and anyone who prefers fewer refills. If you value long temperature retention, durable stainless construction, and the convenience of two lid styles, this mug is designed to meet those needs without adding bulky weight or complicated care requirements.