Sheena Vasani writes about tech news, reviews gadgets, and helps readers save money by highlighting deals and product recommendations for The Verge . To celebrate founder Peter Dering’s birthday, Peak Design is taking up to 50 percent off a host of bags and accessories through May 8. The sale includes steep discounts on many of the company’s most popular backpacks and bags, as well as a couple of other items, including camera accessories. Many Verge staffers are fans of Peak Design, in part because the company is known for making durable, weatherproof products that can house a range of gadgets. Most of its bags are built to carry a lot of gear without feeling bulky or disorganized, thanks to thoughtful extras like expandable storage, quick-access openings, and customizable dividers, which make them great for daily commutes and summer travel alike. Plus, most Peak Design gear is backed by a lifetime warranty , so if something breaks or stops working during normal use, the company will repair or replace it.…