When you want to add lightweight and minimalist dry storage to your pack system, look no further than the J-Type Zip-on Dry Bags. 4,000 c.i. of seam taped storage to keep all your necessities dry with side zips to allow the bag to zip right on to the F1 Mainframe or the J-34 "Just One" Pack. At only 8oz. you'll barely know it's there until you need it! Available in Military Green or Mountain Camo.