Men’s Journal aims to feature only the best products and services. If you buy something via one of our links, we may earn a commission. REI is in the midst of a massive Labor Day sale , offering shoppers up to 40% off (or more, if you know where to look) over 3,500 newly marked-down products from breathable sun hoodies and fall-ready jackets to smartwatches and bestselling camping tents . The sale runs until Sept. 2, but some of the retailer's best gear i...