Excellent quality.
I've taken these on about five trips so far.  They've endured air pressure and altitude changes from flying and have spent quality time in a hot car.  Not even a hint of a leak so far - I love it.  These are soft, durable, and seal well.  They were easy to fill, as the mouths are relatively wide.  They dispense well, although I've yet to test them on something with an extremely thin consistency.  So far, I've filled them with lotion, shampoo, conditioner, sunscreen, and hair gel.  Would buy again.
Rating: 5 stars