If three’s a trend (as they say in fashion), I guess five or six is a phenomenon. Such is the case with this structured bookbag from The Cambridge Satchel Company, a UK-based bag maker whose retro-inspired cross-body has become all the rage among fashion insiders.

While the company makes its most popular style in a range of classic colors – from basic black to saddle tan to brick red – it’s the fluoroscent green and yellow hues that are being carried by in-the-know fashionistas. Modeled after a classic school bag, this boxy unisex carryall was given a thoroughly modern makeover in shades so bold they almost glow in the dark (making them really pop against the all-black ensembles worn by most New York showgoers).

I first spotted this bag on Marie Claire editor (and street style blog magnet) Joanna Hillman at the Missoni for Target preview back in June. Then this past week, I noticed no fewer than five other industry insiders, including stylists Susan Joy and Brad Goreski, carrying their own fluro satchels. Which makes sense, since they come in several sizes and are designed to hold all one’s New York Fashion Week essentials in style (bonus points for having your initials monogramed on the flap in gold lettering, as Brad and Susan did).

Why should kids have all the fun? These of-the-moment bags let you channel your inner child in high style – without having to do homework.

Lauren David Peden writes for Rue La La as a Contributing Editor.