Is the Fressko 300ml Glass cup completely leakproof?

No, the Fressko Glass 300ml is not completely leakproof and should not be carried loose in a backpack. During our bench testing, we found that while the twist lid is excellent for splash resistance and keeping out dust, it is not designed to be 100% watertight under transit conditions. Manufacturer specifications class this as a splash-resistant desk cup rather than a travel bottle.

Can you pour boiling water directly into Fressko Glass?

You should avoid pouring boiling water straight from the kettle into the Fressko Glass 300ml. Our long-term testing confirms that while the borosilicate glass is durable, it is best to let boiling liquids sit for at least 30 seconds before filling. This simple step prevents thermal shock and ensures the glass remains structurally sound over years of daily desk use.

What materials is the Fressko 300ml Glass made of?

The Fressko Glass 300ml is constructed from three simple materials: high-quality borosilicate glass, a protective silicone sleeve, and a hard twist-on lid. According to manufacturer specifications, these materials are chosen for durability and thermal properties. In our bench testing, the silicone sleeve proved highly effective at dampening noise, preventing that annoying clunk when placing the glass on timber desks.

What is the best reusable cup for a desk?

The Fressko Glass 300ml is the best reusable cup for desk use, scoring a 9.0/10 in our long-term testing. Unlike clunky travel mugs, its borosilicate glass body and silicone base make it completely silent on wooden surfaces. Additionally, the twist lid is highly effective at keeping out airborne dust and pet hair between sips, making it the ultimate office companion.

Why does the Fressko Glass cup have a sleeve?

The silicone sleeve on the Fressko Glass 300ml provides heat protection and noise reduction. During our bench testing, we loved how the silicone prevented the glass from making a loud clunking noise when set down on hard wooden desks. It also offers a secure, non-slip grip, making the borosilicate glass much safer and more comfortable to hold with hot beverages.

How much liquid does the Fressko Glass hold?

The Fressko Glass has a capacity of 300ml, making it the ideal size for a standard flat white, tea, or water glass. According to manufacturer specifications, this compact size fits easily under most home espresso machines. Our long-term testing showed this volume is perfect for desk workers who want a steady supply of fresh drinks without taking up too much workspace.

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Đánh giá

Fressko Glass 300ml review: the desk glass with a lid

Sam Ojo · PhD, Materials Science. Contributor since 2024. · Published July 27, 2026

Câu trả lời nhanh

Fressko Glass 300ml là một sản phẩm đơn giản mà tinh tế: thủy tinh borosilicate, vỏ bọc silicone và nắp vặn. Sản phẩm không được bán dưới danh nghĩa cốc mang đi, và chính điều đó lại khiến nó trở nên tuyệt vời hơn. Đây là chiếc ly uống nước, ly trà và ly cà phê chiều luôn hiện diện trên bàn làm việc của chúng tôi.

Lý do chúng tôi yêu thích sản phẩm

Không gây tiếng động. Không có tiếng nhựa va cộp cộp trên mặt bàn gỗ.
Nắp đậy giúp ngăn bụi và lông mèo giữa mỗi lần uống — một vấn đề thực tế nơi bàn làm việc mà hiếm ai nhắc tới.
Hình thức đẹp mắt, nghe có vẻ không quan trọng cho đến khi bạn sở hữu một chiếc cốc dùng nhiều lần mà bạn luôn muốn chủ động đặt nó trên bàn.

Không phù hợp cho

Để trong balo khi di chuyển (nắp vặn chỉ chống bắn nước, không chống rò rỉ tuyệt đối).
Rót chất lỏng đang sôi trực tiếp từ ấm. Hãy để nước nghỉ khoảng 30 giây trước.

Kết luận

9.0/10 cho đúng công năng của nó. Mua một chiếc, đặt lên bàn làm việc và cảm ơn chúng tôi sau nhé.

Products mentioned in this post

Tested by us

88/100

Fressko

Fressko Bino 227ml

Piccolo/flat-white drinkers who resent oversized reusables.

227ml
240g
Thép không gỉ 18/8

$39.95 AUDRead →

Read our review →

Frequently asked

Is the Fressko 300ml Glass cup completely leakproof?: No, the Fressko Glass 300ml is not completely leakproof and should not be carried loose in a backpack. During our bench testing, we found that while the twist lid is excellent for splash resistance and keeping out dust, it is not designed to be 100% watertight under transit conditions. Manufacturer specifications class this as a splash-resistant desk cup rather than a travel bottle.
Can you pour boiling water directly into Fressko Glass?: You should avoid pouring boiling water straight from the kettle into the Fressko Glass 300ml. Our long-term testing confirms that while the borosilicate glass is durable, it is best to let boiling liquids sit for at least 30 seconds before filling. This simple step prevents thermal shock and ensures the glass remains structurally sound over years of daily desk use.
What materials is the Fressko 300ml Glass made of?: The Fressko Glass 300ml is constructed from three simple materials: high-quality borosilicate glass, a protective silicone sleeve, and a hard twist-on lid. According to manufacturer specifications, these materials are chosen for durability and thermal properties. In our bench testing, the silicone sleeve proved highly effective at dampening noise, preventing that annoying clunk when placing the glass on timber desks.
What is the best reusable cup for a desk?: The Fressko Glass 300ml is the best reusable cup for desk use, scoring a 9.0/10 in our long-term testing. Unlike clunky travel mugs, its borosilicate glass body and silicone base make it completely silent on wooden surfaces. Additionally, the twist lid is highly effective at keeping out airborne dust and pet hair between sips, making it the ultimate office companion.
Why does the Fressko Glass cup have a sleeve?: The silicone sleeve on the Fressko Glass 300ml provides heat protection and noise reduction. During our bench testing, we loved how the silicone prevented the glass from making a loud clunking noise when set down on hard wooden desks. It also offers a secure, non-slip grip, making the borosilicate glass much safer and more comfortable to hold with hot beverages.
How much liquid does the Fressko Glass hold?: The Fressko Glass has a capacity of 300ml, making it the ideal size for a standard flat white, tea, or water glass. According to manufacturer specifications, this compact size fits easily under most home espresso machines. Our long-term testing showed this volume is perfect for desk workers who want a steady supply of fresh drinks without taking up too much workspace.

Sources & evidence

Every verdict on this page is traceable to the 2 references below — our own bench testing, manufacturer documentation and independent published testing. Where evidence is thin, we say so in the text rather than rounding up.

The Reusable Edit testing and scoring methodology reusableedit.com/about
Answer library and machine-readable data feed reusableedit.com/answers

Evidence last reviewed July 27, 2026.