I recently started using Idealshape and Quest as my shake diet. the Voltrx protein bottles work great with thick powders and anything else you want to add. The bottles are BPA free and the snap-on lids are very sturdy and won't come loose when moving around in lunch boxes or bags.
The mouth opening is wide enough to provide comfort and can also open wide enough to accommodate thicker shakes. They wash up well in the dishwasher. The shaker bottles are clearly labeled with measurements on the side.
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