The Shaker itself works great and keeps tight.
I fill me the milk into the shaker and transporting the powder in a small box.
Shaker untwist, powder pure, use Schlagsieb, unscrew the lid and shake 2-3 times and shake is finished.
My expectations were exceeded here because of shake is really free of lumps, it I had before buying
my doubts.
I would recommend this product only.
+ Sealing
+ Lump-free mixing
+ Easy cleaning