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The 5 Best Mugs for "Grandpa Style" Brewing (2025 Guide)

Grandpa Style brewing requires no strainer, no teapot, and no fuss. You just need hot water, leaves, and—most importantly—a tall, clear glass.

Why glass? Because half the joy of this method is watching the "agony of the leaves" as they unfurl and dance. We have reviewed the best heat-resistant borosilicate glasses and double-walled tumblers that let you enjoy the view without burning your hands.

A collection of tall glass mugs filled with tea leaves and hot water.
Best Overall (The Classic)
Bodum Pavina Double Wall Glass

1. Bodum Pavina Double Wall Glass (350ml)

★★★★★ (The Gold Standard)

This is the iconic choice. The double-walled design insulates the tea, keeping it hot while the outer glass remains cool to the touch. The shape is perfect for watching Oolong leaves expand, and the lip is thin for comfortable sipping.

Pros:
  • Double wall = No burnt fingers
  • Beautiful aesthetic
  • Dishwasher safe
Cons:
  • Can be fragile if dropped
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Best With Handle
Kinto Cast Tea Cup

2. Kinto Cast Tea Cup

★★★★☆ (Minimalist Design)

If you prefer a handle, Kinto's Japanese design is elegant and functional. The glass is thin but surprisingly durable (heat-resistant glass). The straight sides allow leaves to stack nicely at the bottom, making it easier to drink from the top.

Pros:
  • Ergonomic handle
  • Laboratory-grade glass
  • Very light
Cons:
  • Single wall (gets hot)
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Best Heavy Duty
Libbey Glass Mug

3. Libbey Warm Beverage Mug

★★★★☆ (Indestructible)

This is the classic diner-style glass mug. It is thick, heavy, and hard to break. While not as refined as the Bodum, it is perfect for a rugged, everyday office mug where you don't want to worry about delicate glass.

Pros:
  • Very durable
  • Cheap (often sold in sets)
  • Large handle
Cons:
  • Thick rim isn't as nice to sip from
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Best Travel Tumbler
KeepCup Brew Glass

4. KeepCup Brew Cork

★★★★☆ (On The Go)

Grandpa style works great for commuting. The KeepCup is made of tempered glass with a cork band. The lid allows you to sip while filtering out any floating leaves with your teeth (the traditional way!).

Pros:
  • Tempered glass (tough)
  • Cork band for grip
  • Splash-proof lid
Cons:
  • Cork shouldn't go in dishwasher
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Best Thermos (With Screen)
Double Wall Glass Tea Tumbler

5. Pure Zen Tea Tumbler

★★★★★ (Modified Grandpa)

If you hate getting a leaf in your mouth, this is the solution. It's a double-walled glass bottle with a small removable mesh screen at the top. You put the leaves in the main bottle (Grandpa style), and the screen filters them only when you sip.

Pros:
  • Filters leaves while drinking
  • Leak proof
  • Keeps tea hot for hours
Cons:
  • Harder to clean the bottom
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