blog › beer › keeper review Keeper Review Cannons are fun. Written by CraftJack | Updated 05/26/23 | 0 minutes read Castle Island Brewing Company Keeper Brewery Notes. Don't let this one get by. This flagship India Pale Ale is smooth but punchy; balanced but intense. Despite the colossal amount of hops we cram into this beer, it's still remarkably approachable - for pros and rookies alike - so grab a Keeper and save the day. - Castle Island Brewing Company Details ABV 6.5 IBU SRM Hops Malts+ Notes