Nadstar Vacuum Flask 520ML Stainless Steel Thermos SUS 304

Our review

This is a 520ML straight-sided vacuum flask from Nadstar, built in SUS 304 stainless steel and described as food grade. The listing states thermal insulation performance of 12 to 24 hours, which puts it in the range you would expect from a decent double-walled thermos rather than a basic single-wall bottle. The 520ML capacity sits in the middle of the pack: enough for a personal day out, a commute, or a desk, but not a family-size pourer. It is aimed at all users and listed for outdoor and travel use, so it suits commuters, students, hikers, and anyone carrying their own tea or coffee. Before buying, think about what matters to you. Check the actual mouth width if you want to add ice or clean it easily, since straight cups vary. Confirm the lid type and whether it pours or screws off, because that affects everyday use. Compare against similar 500ML stainless flasks on insulation claims, lid design, and whether the brand offers a custom logo option, which this one does. If you need a larger capacity or a cup-style lid, look at alternatives. Otherwise, this is a straightforward option available on Sokonia.