Advocator 20L Lightweight Cycling Hiking Backpack Water Resistant Travel Small Daypack With Helmet Storage MATERIAL:100% Polyester, SBS Zipper, Fluorescently labeled Size: 27*19*42CM /10.6*7.4*16.5 Inch. Capacity: 20L. Weight: 0.51KG Consists of 1 main SBS zipper compartment with a Thicken Inner Laptop sleeve. 1* front zipper Vertical pocket. 2* mesh side pocket for water bottle /umbrella. 1* top hole pouch for Water bottle. straw, a whistle of Saving is on the strap. 3* Fluorescently labeled in front, 2* Fluorescently labeled on straps for Good looking. This backpack adopt back decompression system adjustable buckle chest strap. Economize your carrying effort: Thickened & widened breathable, adjustable, sponge straps, help reduce the load Made of superior quality polyester. Polyester is the popular and ideal lightweight material for ultra-strong and heavy duty backpacks. Polyester material is heat resistant, making it suitable for outdoor use. In terms of durability, polyester is resistant to shrinking and stretching. Thus, it is also wrinkle-resistant. Polyester is genuinely a resilient material perfect for backpacking. This backpack adopt back decompression system adjustable buckle chest strap. Economize your carrying effort: Thickened &amp; widened breathable, adjustable, sponge straps, help reduce the load <span class="a-text-bold">Hig</span>h utilization rate storage space---Be easily put some daily necessities, clothes and sporting goods; Practical small front pocket,suitable for storing small articles such as mobile phone. <span class="a-text-bold">MULTI COMPARTMENTS.</span> Features a classic shape with several pockets for storage and organization. This backpack has a roomy main compartment, one front zipper pocket to hold small accessories, one internal security zippered pocket for valuable items and two side pockets for water bottle or umbrella.