The CrazyCap 2 Self-Cleaning UV Insulated Bottle is a self-cleaning UV bottle for travel, best for travellers. Rated 4.2 out of 5 across 674 user ratings. The main drawback: narrow opening makes ice hard to add. We scored it 4.2 out of 5.
A UV cap keeps a bottle from ever smelling stale and adds a layer of germ protection to tap or treated water, but it is not a filter. CrazyCap 2 does the first job very well and wraps it in a well-insulated steel bottle; for murky stream water, you would still want a filter to clear sediment the light cannot get past.
NoFussDeal rates the CrazyCap 2 Self-Cleaning UV Insulated Bottle 4.2 out of 5 at $99.00. Last updated September 26, 2026.
A UV-C light in the cap treats the water in 60 seconds with two taps, or 2 minutes with five taps. CrazyCap 2 is certified by NSF International to NSF/ANSI 55, Class B, when used in Crazy Mode.
The cap switches on by itself every four hours to keep the bottle and water free of odours, mould and mildew.
Double-walled, vacuum-insulated, BPA-free 304 stainless steel, rated to keep drinks icy for up to 24 hours and hot for 12 hours.
The rechargeable cap charges through contacts on its top from a small dock, so there is no open port to let water in.
CrazyCap lists the upper temperature rating as 180 °F. Three of the eight owner reviews we read mention it. All of them gave the product four or five stars. Score 89: we started at 84 and added 5 because the owner reviews that mention it are positive.
None of the eight owner reviews we read mention it. 22% of all ratings are three stars or fewer, which is where complaints like this usually sit. Score 78: we started at 84 and took off 6 because opinion is split.
Five of the eight owner reviews we read mention it, and those owners gave the product four or five stars, so the complaints come from the wider group of buyers. None of the reviews we read say what goes wrong, so this score rests on the buyer ratings. 22% of all ratings are three stars or fewer, which is where complaints like this usually sit. Score 78: we started at 84 and took off 6 because opin…
Five of the eight owner reviews we read mention it, and those owners gave the product four or five stars, so the complaints come from the wider group of buyers. None of the reviews we read say what goes wrong, so this score rests on the buyer ratings. 22% of all ratings are three stars or fewer, which is where complaints like this usually sit. Score 78: we started at 84 and took off 6 because opinion is split.
63% of ratings are five stars and 15% are four. 8% are three stars and 14% are one or two. A sizable share of ratings sit low, so weigh the drawbacks below as heavily as the praise. Score 84: its 4.2 star average on a 100 point scale.
Based on 674 Amazon customer ratings, averaging 4.2 out of 5, recorded 12 September 2026. See the reviews on Amazon
| 5 stars | 63% | |
|---|---|---|
| 4 stars | 15% | |
| 3 stars | 8% | |
| 2 stars | 4% | |
| 1 stars | 10% |
Cap seams to work perfectly (of course you'd really only know if it failed), simple to use very long charge. Charges overnight and lasts over a week, great for traveling and the charger is s… Read it on AmazonHeather/Joe · May 12, 2020 · Verified
This is an amazing purifier. So simple. You fill the bottle with water from ... wherever, and then press the button (twice) on top of the cap, swirl the water a bit during the 1 min (or 2.5 … Read it on AmazonPeg Sue · March 17, 2020 · Verified
I have been using this bottle since March of 2023. Overall the bottle is great. It is extremely durable and keeps water cold for almost 24 hours. However, my cap will no longer charge. Not s… Read it on AmazonBrandon Williamson · October 8, 2023 · Verified
We bought two of these to use for day hikes in the mountains and as a source of potable water during emergencies.Pros:- easy charging- the lid is designed to be contacts for a USB charger- f… Read it on AmazonSTRINAK · July 3, 2021 · Verified
February 17, 2021: this is a day 1 review. So far all As. This is an attractive bottle though I obtained it because of the self-cleaning function. I read lots of reviews in this product rate… Read it on AmazonJVM123 · February 17, 2021 · Verified
I used to own a Larq water purifying bottle. It worked great but it didn't last as long as I would have liked. I hope this lasts at least two years. If it does, it will last longer than my L… Read it on AmazonRobin P. · September 15, 2021 · Verified
Peel the small protective films off the top of the cap and from the inner rim. If left on, they can block charging or end up in your drink.
Place the cap on its charging dock. The first charge may take a few hours.
Fill the bottle and screw the cap on. For cloudy natural water, filter it first.
Tap the cap twice for a 60-second cycle, or five times for the 2-minute cycle, and gently swirl the bottle while it runs.
For most buyers, yes: we score it 4.2 out of 5. The narrow mouth, lack of an off switch and mixed cap reliability are the trade-offs.
Rated 4.2 out of 5 across 674 user ratings, with 63% giving it five stars and 10% one star.
Narrow opening makes ice hard to add. UV does not filter sediment or chemicals.
Hold the cap over small items such as a toothbrush or phone to expose them to UV light. Keep it away from your eyes and skin.
CrazyCap 2 combines a sturdy vacuum-insulated steel bottle with a UV-C cap that treats water in 60 seconds or 2 minutes and cleans the bottle automatically every four hours. Its NSF/ANSI 55 Class B certification makes it a strong supplemental treatment for tap and travel water, though it is no substitute for a filter with cloudy wild water. The narrow mouth, lack of an off switch and mixed cap reliability are the trade-offs.
A clever, well-insulated bottle that keeps water fresh and adds a real layer of UV protection. Understand its limits with untreated water, and keep your warranty details in case the cap gives out.
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