Blender Bottle ProStak is a hybrid between Blender bottle GoStak and Blender bottle SportMixer. The ProStak is a good and solid bottle, and it has same improvements over the GoStak and SportMixer. It is made of damage-resistant and BPA-free material. The most obvious improvement is that the ProStak's lid can lock so that you don't have to keep pressing your thumb on the lid during blending. The mixing ball has spiral design to enhance the mixing capability. Blender bottle has been around for quite long time but there isn't any single negative review about the product line. Customers should buy it with confidence.
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