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 Amazon.