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

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

Γρήγορη απάντηση

Το Fressko Glass 300ml είναι κάτι όμορφα απλό: ένα βοριοπυριτικό γυάλινο ποτήρι, μια θήκη σιλικόνης, ένα περιστρεφόμενο καπάκι. Δεν πωλείται ως ποτήρι ταξιδιού και είναι καλύτερο γι' αυτό. Είναι το ποτήρι νερού, τσαγιού και απογευματινού καφέ που μένει μόνιμα στο γραφείο μας.

Γιατί τελικά το αγαπήσαμε

Είναι αθόρυβο. Κανένας πλαστικός θόρυβος πάνω στο ξύλινο γραφείο.
Το καπάκι κρατάει τη σκόνη και τις τρίχες της γάτας μακριά ανάμεσα στις γουλές, που είναι το πραγματικό πρόβλημα του γραφείου για το οποίο κανείς δεν μιλάει.
Δείχνει όμορφο, που ακούγεται αμελητέο μέχρι να αποκτήσεις ένα επαναχρησιμοποιούμενο ποτήρι που θέλεις πραγματικά να αφήνεις σε κοινή θέα.

Ακατάλληλο για

Μεταφορά σε σακίδιο (το περιστρεφόμενο καπάκι είναι ανθεκτικό στο πιτσίλισμα, όχι πραγματικά στεγανό).
Βραστά υγρά απευθείας από τον βραστήρα. Αφήστε τα να σταθούν πρώτα για 30 δευτερόλεπτα.

Ετυμηγορία

9.0/10 για τον πραγματικό του σκοπό. Αγοράστε ένα, βάλτε το στο γραφείο σας και ευχαριστήστε μας αργότερα.

Products mentioned in this post

Tested by us

88/100

Fressko

Fressko Bino 227ml

Για όσους πίνουν piccolo/flat-white και απεχθάνονται τα υπερμεγέθη επαναχρησιμοποιούμενα κύπελλα.

227ml
240g
Ανοξείδωτο ατσάλι 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.