This is very close to the same bag. I didn't check the dimensions but a very good alternative. If you want the Yukon, wait, they seem to keep coming back. I would rec. to subscribe to Woot and they will send you their latest deals.
Yukon Tactical Explorer Side Pack$29.99 $49.99 40% off List PriceCondition NewColor - Select - Coyote Black Olive Drab Storm Grey Quantity 1 2 3 Limit 3 per customerShipping
Hehe, I was going to post a link to woot's page again but thought it was starting to look like I was a paid *****. I just really like the bag. I bought one for my wife and she hauled it to Europe on a trip last summer.