Review on 👑 Simple Modern Flip Lid with Handle - Fits all Summit and Hydro Flask Wide Mouth Water Bottle Sizes - Midnight Black by Jeff Aulia

I haven't had this cover for a long time and I wash it often. A couple of times there was mold under the lid. ROUGH! I thought it was poor maintenance on my part, but whatever, the mold gets under the lid. Now it's under the cover AND under the sealant which there is no access to. Apart from the annoying mold aspect, the lid is not 100% tight. I'd say it's 80% tight and leaking randomly for no apparent reason. Updated: 06/18/18. My husband was able to dig up the sealant so the mold could be accessed and removed (see picture). Most likely this is a temporary solution to an existing problem with this cover. The lid needs a better design with detachable parts (there is a detachable transparent ring inside) to ensure thorough cleanliness.