Earlier this year, 31 craft brewers from around the country gathered in small teams to brew beers for a one-time-only variety pack.

The brewers assembled at the behest of Sierra Nevada Brewing Company. Ken Grossman founded Sierra in Chico, Calif., in 1979, back when craft brewing wasn’t a thing. Last year, according to the Brewers Association, Sierra was the third-largest of the more than 4,000 craft breweries in the United States. The special variety pack, part of Sierra’s “Beer Camp Across America,’’ is an attempt to unite some of those brewers.

Canton’s Trillium Brewing Company was one of the breweries that signed on.

“We say ‘no’ a lot,’’ writes Esther Tetreault in a blog post. She and her husband, JC, run Trillium together. They said yes to Beer Camp, Tetreault writes, because “it’s just the two of us and we have felt very isolated. Our friends are proud of us, but they don’t really understand the challenges. You know who does? Other brewers.’’

In January, the Tetreaults joined brewers from Dogfish Head, Lawson’s Finest Liquids, and Stoudts Brewing at Devils Backbone Brewing Company in Virginia to brew Pat-Rye-OT, a pale ale with rye and apples. The 12-pack featuring that beer and five others hit stores last week.

The first notable thing about the Beer Camp Across America pack is the price, north of $20 and in some cases approaching $30. In the pack are two each of Pat-Rye-OT, Sweet Sunny South (a Southern table beer), Moxee Moron (imperial session IPA), Family Values (imperial brown ale with cocoa), West Latitude (session rye with hibiscus), and Stout of the Union (robust stout).

Trillium fans will notice the influence of the Tetreaults (and Lawson’s Finest Liquids owner Sean Lawson) in the brightly hopped Pat-Rye-OT, which is the best beer of the bunch. Good, too, is West Latitude, which uses Maui Brewing Company’s involvement as an excuse to put hibiscus flowers into a darker-than-expected rye beer.

There’s some questionable naming in the pack centered around the term “session,’’ now commonly used by brewers to denote lower-alcohol beers you can pop back a few of during a bout of drinking. West Latitude seems especially flavorful for a session beer, until you see the 5.5 percent ABV and realize it probably doesn’t qualify as one. Neither does Moxee Moron, the “imperial session IPA,’’ which is both a play on words and a solid, malty, bitter beer.

Beer Camp Across America also features six festivals around the country where you can try the other brews from the 12-pack, as well as beers from a combined 500 breweries (Sierra says any brewery that wants to pour at the festivals is welcome). Beer Camp Across America comes to Boston’s City Hall Plaza June 18.

Gary Dzen can be reached at gary.dzen@globe.com. Follow him on Twitter @GaryDzen.