Mardingtop 30L Water-resistant Hiking Daypack/Camping Backpck/Travel Daypack/Casual Backpack for Outdoor Climbing School-5943Green -SBS Zipper:SBS brand zippers,easy to zip and unzip. -Compression Straps:Minimize your pack's profile,reduce excess movement,and keep your gear from getting jumbled. -Adjustable Sternum Strap:Stemum strap with emergency whistle buckle. -Outstanding Padding:2long padded areas on the back promoting air circulation along your back. -WARRANTY- Includes 90 days limited warranty.