The odd thing about the bottles is that they can be unscrewed in two separate areas: at the top but also in the middle, where it looks like the bottom half can be used as a cup. The midway opening might also make it easier to clean the bottles.
Among the different designs are ones with straws, but also ones with a notch for easy hooking and carrying.
The seasonal bottles are being offered in countries including China, Taiwan, and South Korea.
Images via Starbucks.