Some markets’ bulk-bin aisles are managed more efficiently than others. A visit to the TP-SS Co-op reveals a near-ideal scenario with more than 200 items. The area is spotless, monitored on the half-hour. Customers fill their preweighed containers brought from home. Airtight gravity bins are a midrange height, made of BPA-free materials, and, most importantly, are filled with what works best in them, such as dried beans, nuts, wrapped candies, seeds and rice. Wider scoop bins hold granolas, dried fruits, flours and grains, while closed, rolling bins carry the “high-volume” items such as oats and flours.