I have both because I couldn't decide between them. 2dap lends itself to duffel style like packing which is more convenient when used as a gym or travel bag. The blitz is better as an every day carry due to the small organizers and easier access to laptop from the top. Also it compresses really small if empty which is great if you're not taking a lot of stuff. So these would be the main things I'd recommend to consider when deciding. Other than that, the blitz has what seems to be some small improvements (velcro in laptop sleeve, strap keepers, compression straps that run over bottle compartments to secure them...) But not enough to say one bag is better than the other. Capacity seems the same.
Thank you for your comment. Before purchasing blitz30, I was thinking of selling 2dap, but while making this video, I realized the merits of each, and now I can't sell 2dap.
Very, very interesting video. Many good ideas for apartment and limited space amateur radio operation. I hope you do not have to open the window too frequently. The window pass cable is ok if not very disturbed. I have several. Also, QRP cw here with FT-818 and QRP K2. GL es 72.
Thank you for your comment. There is no hole on the wall because there is no air conditioner in this room. So I reluctantly chose this way. The window on this side is always closed, so it's okay! Various ingenuity is necessary to operate amateur radio in Japan.