25
Also, although I am not a large person (I wear a US size 2/4) I could only arm carry the B25 on my forearm... not in the crook. If I had to grab something with the same hand that the bag was on, it dangled in mid air very awkwardly. It did not rest in a comfortable spot for me if I needed to use that hand. I grew tired of that fuss also. After about 4 wears, I was over it. That was also the same time that I acquired my first Constance 24. Once I got that, the B25 was never used again. As I stated before the B25.. size wise is amazing. Yes the Constance is a bit smaller but it worked for my minimal stuff. Sooooo if you're goal is to downsize, I HIGHLY recommend the Constance if you have never tried it.... HIGHLY.