I bought these because I thought the lid design meant they wouldn't leak if on their side but they will. Not a problem with the tall one but I use the short one while sitting up on my bed. Now I've got another big coffee stain on the mattress.

I got the two cup order. One cup works good but the other one I was not able to unlock it! Is there a way to loosen the lock? Thanks

Works great. Fits cup holders perfectly. Great finish. Use it everyday