Tony Wwrote a review of Hydrapak Seeker Collapsible Water Bottle on July 5, 2017
Familiarity: I've used it several times
What I like:
The 2L shape is ideal for side pockets in backpacks.
The large opening makes it easy to clean and dry.
You can freeze them.
What I don't like:
They're so floppy that they're unwieldy when trying to pour out of them and very hard to drink out of.
They cannot stand up in their own.
I haven't found any compatible accessories.
I thought these would replace my Platys but they won't. In fact, I don't know if I will ever use this again. Super bummed about these bottles.