Mountaintop 50L hiking backpack

EXPANDABLE COLLAR- An extension collar with drawstring on the top can expand the pack and increase the main compartment capacity by 5 liters. -BIG FRONT POCKET- Zippered front pocket comes way down to the bottom. -6 COMPRESSION STRAPS- For tying up your pack or hanging sleeping bag, tent, hammock, and other gears. Elastic bands on them can keep the extra strap from dangling all around the pack