I'm not sure if maybe my cap is defective or if this is a normal issue, but sometimes the blue ring gets pushed out of place. I've been using it on my bottle daily for about 2wks, and it's happened twice so far. It's difficult to pull it back into place, especially if my nails are short and I can't find something to hook it. Maybe I should contact customer service about this issue. Other than that, I really love the sport cap. Very convenient when you need to easily open it one-handed, and my toddler can take a drink too.