These are made of Pet plastic so they're impermeable to oxygen. You can age your brews in these for a year or more with no ill effects. Better than glass carboys because you don't have to worry about these breaking.

I use my two for secondary fermenting and they work perfect! Easy to clean, no worry of glass shattering......just perfect.

The shipping was really fast. I just received the carboys and haven't used them but they seem well-made and are smooth on the inside. I expect they'll work perfectly as secondary fermenters. The suggested rubber stoppers fit perfectly too.

I have always had trouble storing my glass carboys and worrying about the way they are stored. I have these just tossed up on a shelf. I can stack them put stuff around them and never have to worry about them breaking. I love these.

Good design, good product but the opening is bigger than the Better Bottle version. Which is too bad because the stopper and traps are not interchangeable. They couldn't make a uniform size could they?

I've been using one of these for a secondary, and it works great. It is just the right size for a 5 gallon batch of beer, and leaves almost no head space. Plus, when moving one of these around, you won't worry about it shattering, and cutting you up. These are a little harder to clean, and will scratch and dent, but they're still pretty durable. They are supposedly more oxygen permeable, but I haven't noticed any oxidation in my beer. I would recommend these over glass carboys any day.

Before I purchased a plastic carboy for aging sour beers, I was skeptical of any oxidized off flavors. Using this plastic carboy for the last year, I have never been able to detect any off flavors in my delicious 11 month old Flanders Red...no fear...go for iiit, plastiiic!

Very happy with this 5 gal carboy - minimizes airspace after racking from Primary carboy, always a perfect fit when starting a kit with 6 gal of spring water.

I thought these would have broken on me by now, haha but they are pretty durable and easy to clean. I have broken a glass carboy before, so I feel much safer using these.

As I'm stil fairly new to homebrewing, I'd heard some horror stories from friends about glass carboys. Looked into plastic options and decided on this for a secondary fermenter. Only downside is that I find the #10 stopper can easily get stuck in the neck of the bottle, so I purchased a #10.5 as well. With a bit of work, I find this is a bit simpler to use and to get in and out.

been using this for over a year, dropped it several times, no damage.