Basically these do exactly what you hope and expect they will do. I love that they stand up when filled, and the carabiners are a thoughtful plus. I have two nits to pick:
1) I don’t love the plastic material. I expected it to be a bit more compliant. This material is actually pretty stiff. I can’t say why it matters to me exactly — maybe it’s the fact that you feel like you’re putting them under too much stress if they have to be forced into space in your pack/luggage when filled. That said, I’ve taken them on two motorcycle camping trips and they have performed just fine under minor abuse.
2) The valves are pretty difficult to engage/disengage. Maybe they will loosen up over time.