B bottle / Saugflasche

All made with silicone rubber,so it's like water-filled ball,
using it's softness and pressuredifference make the bottle vacuum inside.

When using this bottle,first squeeze bottle make air out of the bottle,next, release the hand,
because the bottle want to change back to its original state,but the second component blocked outlet,
so pressuredifference create the rough vacuum,and the bottle is fixed in this way.

When feeding,gently press the outside of the second part.It's easy to turn on by person.