I bought the mug in front of about a year. Since I fill pure coffee every morning and can drink the 3h later beautifully. The container is sealed and it also runs from nothing when the vessel in the passenger footwell "rumrollt". Once I filled a carbonated drink, after a while I could not open the lock because the counterpressure from the inside was too high. Conclusion: Bam! Seals are laterally slipped ... No problem, nothing broken! Again neatly assembled and everything was okay.
So: For coffee and other non-carbonated soft drinks a super companion!
