Almost every question we get about Hermès eventually becomes the same question: Kelly or Birkin. Both are hand-stitched, both take a long time to make, and both sit at the top of the secondhand market. But they are different bags to live with, and on the vintage market they behave differently too. Here is how our team in Japan actually sees the two compare.
The basic difference
The Kelly is a closed bag: a single top handle, a front flap with two straps and a turnlock, and a detachable shoulder strap. It is formal, it takes a moment to open, and it holds its shape. The Birkin is an open-top bag: twin rolled handles, a flap that folds over but does not have to be locked, and no shoulder strap. It is faster to use, more casual, and more accommodating when overloaded. The Kelly came first, evolving from a 1930s travel bag; the Birkin arrived in the 1980s and was designed around practicality.
Sizes you will encounter
- Kelly - most commonly 25, 28, 32 and 35, measured across the base in centimetres. The 28 is the everyday standard, the 25 is the most in demand, and 32 and 35 are the older, roomier sizes that dominate genuinely vintage stock.
- Birkin - most commonly 25, 30, 35 and 40. The 30 is the reference size, the 25 carries the strongest premium, and the 35 and 40 are the travel proportions.
- Sellier vs Retourné (Kelly only) - Sellier is stitched with the seams outside, giving crisp corners and a rigid box. Retourné is stitched inside and turned, giving softer, rounder edges. Sellier is usually made in stiff leathers like Epsom; Retourné in Togo or Clemence.
How they wear over time
The Kelly's weak points are the four corners of a Sellier body, the base of the handle, and the strap holes on the closure. Because it is a rigid structure, damage shows sharply. The Birkin's weak points are the handle bases, where sweat and load meet, and the four base corners where the bag is set down. Birkins also stretch: a well-used one in soft leather will slouch noticeably compared to a fresh one. Neither of these is a defect, but both drive price.
What to inspect before buying vintage
- Corner leather. Look for rubbing that has gone past the surface finish into the leather itself. Corners are the most expensive area to restore.
- Handle condition. Darkening is normal. Cracking or a spongy feel is not.
- Hardware. Plating wears through on the turnlock and feet first. Check that all four base studs are present.
- Accessories. Clochette, keys, lock and, for a Kelly, the shoulder strap. A missing strap or lock set reduces value materially.
- Structure. Stand the bag empty. Sagging, a collapsed base or a leaning body all point to years of overloading.
- Interior. Pen and cosmetic marks are common and permanent. Odour is worth asking about directly.
Price reality, honestly
Both bags run well into five figures in USD for the majority of examples on the secondhand market, and the smaller sizes in neutral colours with gold hardware sit highest. Genuinely vintage pieces from the 1980s and 1990s - larger sizes, older leathers, honest wear - are the softest part of the market and can be meaningfully more affordable than a recent bag, sometimes dramatically so. Exotic skins occupy a separate tier entirely. Anyone quoting a narrow figure without seeing the bag is guessing; condition, completeness and colour move these prices further than any other category we handle.
If your priority is daily practicality rather than the top of the market, we would honestly point you at the Bolide or the Herbag first. When we do have Kelly or Birkin pieces, they appear in our Hermès collection, and every one is graded using the system explained in how we grade condition.