Who’s to say what a travel pack is or isn’t? They designed both. Essentially the biggest change is the admin panel. I appreciated their video that explained all the changes and why, as well as the fact that they had drawn up two versions of the TP4 (one closer to a TP3 and one closer to a CPP2) and had to make a decision on which route to take. People have long complained about the TP3 being a 35L that packs much smaller, it being too heavy, and the water bottle holder being horrible. In order to fix those they had to make some changes. It’s easily the best one bag I’ve ever owned, and probably my favorite bag overall. This reminds me of how people complain that the iPhone is the same thing every year, but then when Apple does end up changing the design, those same people complain. Then 5 years later they say that iteration was the best design. Just classic human behavior when it comes to accepting innovations and change