This is a new, unused bottle. A circular bottle it measures 5" high, 2 1/4" at base (measurements are approximate). The bottle comes with a clear lid. The caps are bpa-free plastic and snap on and off the bottle. The caps are airtight, but not leak proof, so don't lay the bottle down. The caps will last several months until they become loose and aren't as tight on the bottle anymore. Caps can be purchased separately.
You should hand wash the caps, but can dish wash the bottles.
The half pint size has been seen quite a bit on the event circuit filled with chocolate milk and a straw. Our bottles were used in a photo shoot - this time filled with lemonade and a straw - in the 2012 winter issue of Yum Yum for Kids.