Just as you mastered the art of packing the perfect diaper bag, he’s potty trained and headed to preschool. Help him make sure he’s got this one in the bag.Step One: Find the perfect carryall. It should be big enough to hold essentials (a snack, a sippy), but not so large that it weighs him down. Our pick: the handmade cotton and linen messenger bags from Mee a Bee ($25-$40), sized to sling across the chests of scholars ages 3 to 6.Step Two: Leave a paper trail. Ecojot’s latest collection of spiral-bound sketch pads and journals ($4.50-$17) supports the Jane Goodall Institute with collage-inspired cover images of endangered species. But it’s the recycled, unlined paper and heavy-duty back cover that give kids what they need to write and draw.Step Three: Color it in. P’kolino’s art set ($20) is a cornucopia of jumbo markers, triangle and wrapper-free crayons, and hexagonal colored pencils — all designed to fit little hands. So practicing good form is as easy as one, two, three.Looking for the perfect lunch box? Check out our photo gallery.HEARThe Wizard of OzWhat: Atlanta Symphony Orchestra plays the beloved score backed by the movie on a giant screen. Why: The flying monkeys still scare the bejeezus out of you. When: Sat., 8:30 p.m.Where: Verizon Wireless Amphitheatre at Encore Park, 2200 Encore Pkwy., Alpharetta (404-733-5010). Tickets online at ticketmaster.com. Adults and children, $27-$59.GROOVEThe Wiggles Wiggly CircusWhat: The lively Aussie foursome takes to the stage. Why: With all that dancing, she’ll snooze the whole way home. When: Sat., 12:30 & 4 p.m.Where: Gwinnett Performing Arts Center, 6400 Sugarloaf Pkwy., Duluth (800-224-6422). Tickets at 800-745-3000 or online at ticketmaster.com. Adults and children, $13-$78.Photos: Courtesy of Jacqui Miyabayashi / Meeabee; Courtesy of Ecojot; Courtesy of P’kolinoUp to 75% off MLHLynne Hiriak (of Cardigan fame) ups the knitwear ante with ’70s- and ’80s-inspired dresses and sweater tops with color blocks, sequins, and vintage-meets-modern shapes. Take up to 75% off on Swirl.