At home, I use the Magic Bullet blender to make my daily protein shake. But traveling has always presented a problem. Hand shaker bottles just don’t do a great job of blending powdered mixes, and carrying around a little battery powered Cordless Mini Mixer is just one thing too many to travel with — I’m already carrying enough. But the new Blender Bottle shaker cups use a unique round wire ball to do the stirring, and it works great. Buy the 28oz Blender Bottle for $7.99 or the 20oz Blender Bottle Mini for $6.99at Amazon.com.