The "BOOST" expandable backpack is made of durable PVC, with sturdy buckles and zippers. All seams are strong and reinforced. This backpack has three compartments: * a main one to organize clothes and equipment * a second hidden one at the back for a laptop * a third expandable zipped one underneath with mesh insert for dirty laundry. Inside the main compartment, two zipped pockets. On the sides, an expandable open pocket to put your water bottle or bottle and a second zipped one. This bag offers versatility and plenty of space to store your training equipment despite its compact size. * Multi-compartment backpack * Ergonomic padding for more comfort * Adjustable shoulder straps * Two internal zipped pockets * Laptop compartment * Mesh inserts for better breathability of the dirty laundry compartment * High quality zippers with ELION pullers * Washable in hot water * Dimensions: 29 cm x 20 cm x 48.5 cm. * Capacity: 20-25 liters.