Max thanks for the offer we might take you up on it ;)
The Unaweep is optimized for 26 inch frame, but will work on a 28 , it will just be sort of a partial bag / like old externals. It will work on a 24 as well. It basically, just sort of slides up the frame and anchors via hold down straps. At 24 it covers the entire frame, at 26 it has a small gap at the bottom and at 28 the gap increases to about 4 inches.
Regarding bag sizing, a 3900 would be a nice size and we can consider it if we know there are enough orders to do a production run. With the Unaweep, and I am being real honest from a production standpoint, we are trying to bring down price by offering a more standardized options. Customizing each bag, increases cut / sew / management and delivery time. Being more standardized, reduces those and allows us to offer it at a lower price point and once past the first production run, faster lead times, perhaps shipping within a few days for standardized variations vs 4 to 8 weeks for more customized stuff. Heck, we would even be willing to a do a Cuben 3900 run , if there was enough to support a small production run.
So here is what to do, regarding desiring of pack bags. Please send us an email at firstname.lastname@example.org , use the subject line of Unaweep Feature Request. State the sizing and fabric and zipper or no zipper orientation you would like , as well as anything else. We will take these comments, and see if there is a very common thread, and if so add it into our production. We also, may respond back wanting more details. Sound good ?
Now, we added a couple ounces back in on the Unaweep to increase the overall robustness of the design. These packs are still used for heavy loads, and we would rather build them to give many many years of reliable service , even if it adds an ounce or two. We know how we can strip a few ounces and be more inline with UL production methods, but we prefer to strike a balance of long term durability.
Here is the official word on packbag sizing as well. The 4800 is officially, 4950 CI with 3 rolls at 33 inch height. This does not include Water bottle Pockets which ad 500 CI. When rolled down to frame height on a 26 inch frame it is 3900 interior volume.
While on the subject, how do you feel about other colors, like blue , etc. Any particular color you love ?
Here is a link with some more photos