Filled the cup before a four-hour drive and didn't have to stop once to deal with splashing. It clips onto both my wire crate and the plastic one, which is handy since I switch between them.
Evelyn U.★★★★★
The little funnel means I can top off the water through the wire door without unclipping anything, which is a lifesaver at rest stops. It fits both my plastic and wire crates, and nothing sloshed out on a two-hour drive.
Natalie★★★★★
Filling this while my dog is already in the kennel is so much easier than a bottle. The funnel design keeps water going in instead of spilling all over the wire door.