Usually during canning day at Sturbridge’s Altruist Brewing Co., the machine that fills and seals the cans draws the most attention.Only last week, owners Nancy and Bob Bixby were more excited about the new plain-looking rings they’ve started using to hold the cans together.Dubbed “Eco Rings,” the rings have inspired a movement to limit craft beer’s reliance on plastic packaging.Want news like this sent straight to your [...]