Good quality, versatile, but slight after taste only at first.

I found the eighteen oz capacity to be perfect for a 2-3 hour hike or outing. The collapsible feature is great, especially since you can collapse it by degrees as you consume water. I carried it in a backpack, a tote bag and hung it on my belt. It never leaked. It is easy to clean, opens and closes easily. I gave it three stars because of the after taste. After an hour or two, I found it to carry a plastic taste. Not intolerable, just annoying. I need to add an edit, after using the bottle for a couple months I found the after taste to be gone. I continue to use it regularly and find it perfect for hiking and even just casual walks.

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