12" x 24" unrolled. 

 

3 flat pockets each 8" x 12". Each pocket has a patch of loop velcro to attach patched or opposing velcro to identify content of pouch.

 

When rolled up empty its about 2" around. When filled with contents it can expand to 6 inches or so. closes with two straps that have side squeeze buckles. Outside has a patch of loop velcro and a handle.