It Seems Too Simple to Be True
My first thought as I set up for my first session was "What?! This is the actual pump?!" It's hard to wrap your head around such a simple device when everything we've known about breast pumps until now is that they're complicated and cumbersome (not to mention hideous!).
With Willow, all of the parts you see when using a traditional pump (pump machine, breast shields, milk bags, and tubes) are contained in one unit, and there are two of those (one for each breast). To use Willow, you connect the actual pump (the white part on the right in the photo above) to the flanges (the clear part on the left, which replaces traditional breast shields). The milk bag is stored on the inside of the flanges and milk is moved from your nipple, through the flanges into the flextube (which replaces the need for dangling tubes), and directly into the milk bags. When you're done, you take the two pieces apart (the flange side and the pump side) and remove the milk bag.
This is what makes Willow "the only truly wearable all-in-one breast pump that fits in a bra."