If you are looking for a way to make money while you are up in Alaska, this is a great piece of equipment to have. Dredging for gold is one of the more common recreational activities in most of Alaska and Yukon. The fact that you can put this on a backpack makes it all the much better because with two people you can carry a whole campsite along with your gold dredge. If you are planning are trying to get some hard to get to places, this is pretty much your only option besides building roads and getting to it with equipment or hand panning everything. This is by far the best method (especially if you are a two-man crew) and also most efficient means of extract gold from creeks in Alaska. I realize you can always build your own and there are many methods of doing so but the quickest and easiest will also be the priciest.
Building your own gold dredge is probably one of the coolest and most complete products that you can undertake when panning for gold. There are a lot of different options that you can choose and I have found the best tutorials for you so you do not have to search around.
Here are some movies on back-pack dredges working on streams. Its pretty cool to see them go. I wonder how much the average person pulls out in a summer.