INTERNAL WET/DRY SEPARATION BACKPACK: Gym backpack designed with separate PVC compartment for toiletries and wet towel. This gym bookbag features 11 storage compartments (6 external + 5 internal) and 1 key chain. You can easily organize your sports wear, water bottle, and 13-inch laptop. Dimensions: 17.3* 7.1*13 inch（44*18*33 cm）Item weight 1.38 pounds EXPANDABLE SHOE COMPARTMENT: Say goodbye to mixing your dirty sneakers with clean clothes. Bottom shoe compartment fits US Men's 8 / Women's 9. Ideal for daily work out, dance, cheerleading, ball sports. SAFETY AND TRAVEL CONVENIENT: The travel backpack has an anti-theft pocket on the back to keep your phone and wallet safe. Back trolley sleeve works with luggage to make traveling more convenient.This travel backpack is suitable as personal items under your seat. WRINKLE AND WATER-RESISTANT FABRIC: Backpack is made of high-quality polyester fabric that is soft, smooth, and wrinkle-resistant, making the bag strong and structured. Waterproof fabric effectively blocks sweat and rain, making it more comfortable to carry. FITNESS AND STUDY BALANCE: If you're looking for a professional gym bag that also works for school and travel, our expandable gym backpack 26L is the ideal choice. The bottom shoe compartment, dry/wet pocket, 13-inch laptop sleeve, and luggage strap are all incredibly practical.