That doesn't sound normal at all. Which kind of lid do you have? With the press-in or 'sip lid' I can imagine it leaking sometimes, but the basic flex cap should be 100% water proof.
The oring on my fair share mug gave out and would no longer stay in its groove when trying to put the lid on the mug making the lid useless in less than a week. I’m so glad I tested it before leaving for a month. For that reason I started looking for heavier yet more robust options to have an insulated mug in my travels. I landed on the hydro flask lightweight trail series bc I can carry it and eliminate needing a water bottle and insulated mug for coffee and tea. Would an ultralight through hiker want a hydro flask? Probably not. Would a one bag international traveler like the lightweight hydro flask? Probably.
