Yes, in the literature they sell it without the sack, but I bought the bag and sack for $20 complete.
The dry bag has the Exped logo and is marked XL and measures roughly 16″ wide x 24″ long and weighs 4.1oz.
The pack bag weighs 8.5oz.
As to straps, the dry bag has a stiffener at the top and a male and female buckle on opposing sides. It uses the typical roll-and-buckle closure to seal the top.
The pack has mating buckles at the top to clip into the dry bag buckles– clever bit there. The pack buckles are on the ends of straps running up and down the length of the bag to work as compression straps. The straps run up through a series of webbing loops sown up the sides of the pack like a ladder. There are also tabs around the top and bottom of the pack to attach items or make a shock cord zig-zag to stuff items under (my preference). There are two plastic rings at the base of the pack to attach a waist belt to– none offered, you would need to make your own.
The drawstring at the top serves to give the pack better shape and hold in those items stuffed in alongside the dry bag. There is a grommet in the bottom of the pack for a drain.
Outdoor Research took on distributing Exped products in the US fairly recently– it the last year or so? — I’m not sure. So this could be a little fallout from the change in distribution.
You will see odd items in some of the shops around Seattle as items are closed out. Samples end up in the thirft stores from time to time too. REI, MSR, Outdoor Research, Moonstone, Ex Officio, Cascade Designs, and K2 are all headquartered in the area.
K2 has been buying up a lot of outdoor manufacturing companies– check their corporate listings. Their list of logos is a surprise.