It's officially the humble canvas tote 's time to shine. From now until an A-lister's last boat ride this August, the summer staple will swim from beaches to outdoor restaurants and every Hamptons trip in between. Gwyneth Paltrow debuted her under-$180 Alex Mill tote as early as May 13—just as Kaia Gerber , Martha Stewart , and more have done in summers past. Sure, paparazzi caught Paltrow outside her L.A. office, but her seasonal look would shine on a summer Friday, too. She traded traditional laptop bags —typically sculpted from leather or nylon—for Alex Mill's Perfect Weekday Tote , which lived up to its name. Gwyneth Paltrow was spotted in neutrals and her $175 Alex Mill tote. (Image credit: Backgrid) Garment-washed canvas covered the $175 bag, including its two top handles, elongated shoulder straps, and rectangular body. Snap closures atop the entire 13-inch opening made the bag feel more lived-in than a zipper would. It's available in ten summery shades, plus four flexible sizes.…