Now that’s a proper thermos flask. Cheers op. I’ve used these a lot in my past life and can vouch for them being near indestructible for average everyday use - I’ve seen one get driven over by a forwarder (giant forestry machine) and still work. This flask design is way better than their old plastic + glass version 20 years ago. This is great for tea or coffee in winter; keep one in your car or truck if you live remote.