MOUNTAINTOP Mardingtop 45L+5L Hiking Backpck Reflective Band:Improve nighttime visibility when also as an attachment point for your hydration tube. EXPA-Compression Straps:8 adjustable straps can minimize your pack's profile when also for you to hang your hammock, sleeping mat, tent and other accessories.DABLE COLLAR- A extension collar with two drawstrings on the top of the pack can expand it and increase the main compartment by 5 liters capacity. HYD-Bottom Access:Zippered bottom access can easily access to the main compartment or store a small size sleeping bag.ATION SYSTEM COMPATIBLE- Hydration access on a side of the pack with water bladder sleeve in the main compartment. ACCESSORIES- SBS zippers and Durable Buckles. WARRANTY- Includes 90 days limited warranty.