Narrow Mouth Loop-Top Bottle is not too big, not too small; it's just right! The narrow mouth makes for an easy-breezy drinking experience. The closure and bottle create a leakproof system with no o-rings that can fall out. Ideal for carrying water, juice, and other thirst-quenching beveragesNarrow mouth for no-hassle, spill-free drinking, Easy-to-open, attached cap won't get lost.