Fressko Glass Flask 300ml review: A clean desk companion for tea

Quick answer

If you have ever ruined a subtle tea because your stainless flask permanently smells like previous coffee, this vessel is the remedy. Made from borosilicate glass with a clever infuser filter, it keeps flavours completely pure while letting you watch your drink develop. It is designed primarily as a desk companion for tea and cold infusions rather than a rugged travel mug. Because it is uninsulated, liquids will cool at a standard rate, but for mindful drinking at work, it excels.

What the wider world says

In their coverage, The Design Files praised the elevated experience of using the vessel, noting that a glass Fressko feels like a permission slip to drink water like it matters.

Our take

We appreciate the simple honesty of borosilicate glass. There is a distinct functional benefit in being able to see the exact strength and colour of your infusion, which is impossible with opaque metal bottles. Flavour transfer is non-existent, meaning you can switch between herbal teas and cold drinks without any lingering taste. The obvious trade-off is thermal retention and physical fragility. It is uninsulated, so hot drinks cool fast, and glass will break if dropped on hard edges. If it ever does break, the material is recyclable.

Who it's for

This flask is ideal for desk-based tea and cold infusion drinkers who prioritize pure flavour above all else. It is perfect for those who like to visually monitor their brew throughout the workday.

Who it isn't for

Skip this flask if you need thermal insulation to keep drinks hot for hours. It is also not suitable for worksites or throwing into bags alongside hard edges.