Like thousands of U.S. convenience stores, many 7-Eleven stores cram rows of snacks between a wall of chilled sodas and a bank of churning Slurpee machines. But starting this month, 7-Eleven will also begin selling cold-pressed juice. It’s organic, vegan, fair trade, non-GMO, gluten-free – and designed to appeal to an entirely new type of convenience-store consumer. Analysts say the launch is a tiny part of a major trend sweeping truck stops, corner stores and mini-marts from coast to coast.