Expand the capacity of your BlenderBottle® ProStak® system. Extra 100cc and 150cc jars double the initial capacity of your system, while the massive 250cc jar offers ample room for even the largest protein, meal replacement, and on-the-go nutrition needs.
STAY SECURE Built to take a beating, the Expansion Pak jars keep contents in place and your gym bag clean.
TWIST N' LOCK TECHNOLOGY Inspired by the GoStak® container system, Expansion Pak jars can be connected to each other with a quick twist for added portability. Quickly attach Expansion Pak jars to the bottom of the ProStak shaker cup thanks to the unique Twist n’ Lock™ system.
DITCH THE PILL MINDER Take vitamins on the go, without using an entire jar. The unique pill tray locks into any jar lid, making room for both pills & powder in the same jar.
TAKE ONLY WHAT YOU NEED The Expansion Pak jars are designed to be sleek & compact, giving you just enough room for your supplements, without invading your gym bag.