Calling all Nalgene lovers! We've all been there - you drop your favorite water bottle and the lid cracks, or maybe the original lid has just seen better days after years of faithful service. Well, this Nalgene Narrow Mouth Loop Top Lid is here to save the day! Designed specifically to fit both 1 quart and 1 pint narrow-mouth Nalgene bottles (that's the 38mm opening size), this replacement lid is built with the same quality and durability that Nalgene is famous for. The loop top design is super convenient - you can easily attach it to your backpack, gear strap, or carabiner so you never lose it. The secure sealing mechanism keeps your drinks exactly where they belong - inside the bottle, not leaking in your bag! Whether you're replacing a broken lid, want a spare for emergencies, or just prefer the loop top style over your current cap, this is exactly what you need. It's made from the same tough materials that can handle being dropped, banged around in your backpack, or exposed to the elements. For hikers, campers, students, gym-goers, or anyone who relies on their Nalgene bottle daily, having a reliable replacement lid is just smart planning. Don't let a broken lid retire your favorite water bottle - this replacement cap will have it back in service in no time!