From Tumi, the  Alpha Bravo Nomadic Backpack features: Part of the outdoors-inspired Nomadic capsule, this ultra-functional backpack has a tactile pattern that glows in the dark during low-vis excursions. The pattern glows green after charging in the sun or artificial light. Exterior features: Zip entry to main compartment Back zip entry to padded laptop compartment (fits up to a 15" PC or 16" MacBook screen) Top carry handle with leather accent Bottom zip expansion Padded mesh back panel for comfort and support Daisy chains on the front, shoulder straps and side gussets compatible with select TUMI+ accessories Top U-zip pocket Top zip pocket Front zip pocket Front U-zip pocket Back quick-access pocket with hidden magnetic snap closure 2 side zip pockets with chain loops for carabiner attachment and left side water-resistant lining with air-vent Add-a-Bag sleeve Luggage tag Monogram patch The glowing effect varies based on the amount of light it is exposed to. Interior features: Daisy chains compatible with select TUMI+ accessories 2 card pockets 2 media pockets 3 open pockets Zip pocket Padded tablet pocket Translucent open pocket Key leash Pen holder TUMI Tracer® Specifications: Nylon Measures approx. 18.8" x 15.0" x 9.0" Laptop -Fits up to 15" Weight approx. 4.2 lbs. Imported.