The longstanding contest between paper and plastic bags in the checkout line has a new twist for customers at Rosauers Supermarkets outlets. This fall, the Spokane-based chain switched to Eco Hippo sacks, a brand its maker boasts never needs double-bagging and can carry more than 26 pounds of food without breaking. While the translucent, green totes resemble typical disposable, high-density polyethylene bags, they feature a patented, reinforced bottom and are made with post-industrial recycled resin, according to manufacturer Crown Poly Inc., of Los Angeles. That means a reusable bag that advocates say is more eco-friendly than standard sacks, which often are recyclable but frequently end up in landfills.