REI’s annual Anniversary Sale — the retailer’s biggest of the year — has arrived, bringing with it discounts on all kinds of outdoor essentials. If you’ve got a camping trip coming up, now is a good time to stock up on the basics, whether it be a tent, sleeping pad, or stove. If your summer plans involve hiking or heading into the backcountry, there are also savings to be had on everything from Garmin watches to water filters, some of which are also on discount at retailers like…


