The 30 is generally considered the "original" proportion — the size most people picture when they hear the name, and probably the most versatile across the different width options. It's roomy enough to function as an actual daily bag: a full-size wallet, a paperback, a light cardigan folded in, sunglasses case, keys, and there's still a bit of breathing room left. That extra few centimeters over the 25 makes a real difference in day-to-day usability, especially for anyone who isn't willing to switch bags depending on the occasion.
The shape holds the same structured, boxy silhouette as the smaller sizes, but at 30cm it starts to have real presence without tipping into "statement bag" territory. It sits comfortably on the forearm, in the hand, or on a chair back at a restaurant without looking like it's trying to dominate the room. The double rolled handles are sized proportionally, so carrying it doesn't feel awkward the way an oversized handle sometimes does on a smaller bag.
We've found leather choice matters even more at this size, since there's simply more surface area to show it off. A textured or grained leather hides the inevitable light scuffing that comes from daily use — sitting on car seats, brushing against doorframes, that kind of wear. Smoother leathers look sharper out of the box but show every mark within a few months of regular carrying, so this size tends to suit people who either baby their bags carefully or have made peace with visible patina over time.
Color-wise, the 30 shows up across a much wider range than the smaller sizes — this seems to be where people feel comfortable taking a risk on a brighter or more seasonal shade, since the bag reads as a "real" everyday piece rather than a special-occasion accessory. Interior configuration is fairly minimal across most versions: a single slip pocket and a zip pocket, nothing more, so anyone coming from a bag with lots of internal organization will need to adjust expectations. For a lot of people this size ends up being the one bag that has to do everything — work, weekend errands, travel days — and it generally holds up to that kind of demand better than the smaller options in the line.