Features: 

• One-way waterproof valve expels unwanted air after the dry bag has been sealed for minimal pack size.
• 5 lash-down points for easy anchoring.
• Adjustable shoulder strap for easy portage (featured on 20L, 35L, and 50L bags).
• Oval shaped bottom won't roll out of reach.
• Roll down style closure is dry and dependable.

Specs:

• Heavy duty materials are PVC free and will withstand abrasion and punctures.
• Fully welded seams for the most durable and most waterproof construction possible. 
• 50L

About this product:

Innovative, versatile dry bag that expels unwanted air for minimal pack size and can convert to a soft cooler with a Wilderness Systems Freeze Sleeve (sold Separately).