Lululemon Fast Free Backpack Black Sparkle Foil 13L - NWT | eBay。The Lululemon Fast Free Backpack in Black & Gray with Sparkle Foil detailing is a stylish and functional medium-sized backpack designed for active women. This backpack features a solid black exterior with gray hardware accents, making it a versatile choice for outdoor, gym, or city wear. The backpack has a zip closure and an adjustable black strap for a comfortable and secure fit. The polyester and nylon exterior material ensures durability and longevity, while the black lining adds a touch of sophistication. Perfect for workouts or everyday use, this Lululemon backpack is a must-have for those on the move.