Storage underneath is enough for a big scoop of protein or a few scoops of preworkout or any other supplements. Security of the lid and how leak proof it is.

No matter how i close the lid, it spills 20% of the liquid out. The lid has a groove for o-rings but no o-ring and because of this they leak. The handle on the lid flops around.

The bottle frequently leaves tons of powder unmixed. Save yourself the headache and stick to the standard blender bottle brand.

These are over-engineered and *. This is just poorly designed.

It leaks uncontrollably! Both bottles leaking straight out the box! They leak without them therefore both kids are worthless now. They both leak profusely. Even when i finally get it threaded on correctly it still leaks most of the time.