What's the difference between Louis Vuitton's Saumurs? SIZE is one of them. The number in the name indicates the bag's width in centimeters, so a Saumur 43 is 43 cm in width, whereas the 35 is 35 cm in width, and the 30...well, you get it. Further, look closely at the FRONT buckles: the 43 is the only one with 2 closing straps in front. The 35 has 1. The 30 also has 1 but it also has a piece of leather that goes across that strap. All 3 have 2 compartments. Was this helpful? -LVDEE