CAUTION....I do not recommend the trail series as they are incredibly flimsy/delicate compared to the other main Hydro Flasks. The first time I used this I filled it to the brim with water and put it in my snowboarding bag and went on my way. Never dropped or banged and throughout the day when I went to take a sip of water, I gently squeezed the bottle and it dented. I am telling you I am no hulk and it blew me away how delicate this bottle was. Like a simple squeeze and it dents? I did not drop it to cause this but merely squeezed it while drinking water. I called about a warranty but I was told dents are not covered. Lesson learned to not worry about a few ounce weight and stick to the regular Hydro Flasks. This lightweight series it too delicate and almost like junk just to save a few ounces.

An almost perfect water bottle. This water bottle insulates very well and is so much lighter than other insulated bottles I have used. It's not as light as a plastic bottle, but noticeably lighter than other steel bottles I have. Slimmer, too. I only wish that it was designed in a way that the lip of the spout was not exposed when the cap is screwed on. Would make much more sense if it was covered by the cap so that even if the outside of the bottle gets dirty, the part where you drink from is protected. But overall, I am very happy with this purchase.

The lightweight bottle is horrible. Dropped it from my hand at hip level onto airport floor and it completely smashed in the bottom side. It is not usable now because it won’t stand on the bottom without falling over. Contacted customer support as I’ve had this bottle for just over one month and they told me I could recycle my “old” bottle and get a five dollar credit. I have multiple Hydro flask bottles some that are 15 years old and never had a problem. Do not buy this. It will just dent and collapse on the bottom.

I switched from refilling plastic bottles to this HydroFlask and it's been great. It's lightweight enough that I don't miss my plastic bottles. I only kept reusing them because they're so lightweight, but I'm so pleased to have a much better alternative that's manageable. I like the Celestine color I got but would love lots more color options in this model. I'll be purchasing another 21 oz Lightweight Standard Mouth Trail Series HydroFlask soon.