The Three Classic Sizes, Side by Side
Hermès makes the Birkin in several sizes, but the resale market is dominated by three: the 25, the 30 and the 35 (the number is the bag's width in centimetres). The 40 and the travel-oriented HAC sizes exist, but they trade in a niche of their own. Between the three classics, the pattern observed across dealer networks and auction results is remarkably consistent: demand concentrates at the small end, supply concentrates at the large end — and price follows.
| Size | Dimensions | Profile | Demand | Liquidity | Resale Premium |
|---|---|---|---|---|---|
| Birkin 25 | 25 × 20 × 13 cm | Small / handheld | Highest demand, thinnest supply | Fastest to sell | Largest premium over retail |
| Birkin 30 | 30 × 22 × 16 cm | Everyday size | Broadest buyer pool | Most liquid overall | Strong, stable premium |
| Birkin 35 | 35 × 25 × 18 cm | Tote-like | Softer since ~2020 | Slower; price-sensitive | Smallest premium of the three |
Birkin 25: The Premium Leader
The 25 is the size the current market wants most. Fashion has moved decisively toward smaller bags over the past decade, and Hermès produces the 25 in smaller numbers than boutique waiting lists would absorb. The result is the widest gap between boutique retail and secondary-market asking prices of any classic size.
In neutral colours on everyday leathers — think Etoupe, Gold or Black on Togo or Epsom — a 25 in excellent condition consistently asks well above its boutique price. Rare colours and exotic skins push multiples higher still.
What to watch
The 25's premium depends on condition more than any other size — micro scratches on hardware and corner wear are immediately visible on a small bag. It is also the most counterfeited size; buy only with serious authentication.
Birkin 30: The Liquid Middle
The 30 is the compromise size — small enough to feel current, large enough to be a genuinely practical everyday bag. That gives it the broadest buyer pool of the three, which matters when you sell: a fairly priced 30 in a neutral colour is usually the fastest Birkin to find a buyer at full ask.
Its premium over retail sits below the 25's but has been notably stable across market cycles. For a first Birkin bought partly as a store of value, the 30 is the lowest-risk choice: you give up some upside for materially better liquidity.
Birkin 35: Size the Market Left Behind
The 35 was the default size of the 2000s, which means the secondary market carries deep supply — exactly as demand shifted smaller. Asking prices sit closest to retail, discounts appear more often, and time-to-sale runs longer than for the 25 or 30.
That makes the 35 the value buy of the range rather than the investment pick: more bag for less money, with the trade-off that resale upside is limited. Exceptions exist — exotic skins, rare colourways and vintage pieces with documented provenance hold value on their own merits regardless of size.
The Verdict
Buy the 25 if…
Value retention is the priority and you can source one in excellent condition. It carries the market's largest premium — and keeps earning it.
Buy the 30 if…
You want one bag that does everything: daily use, solid premium, and the fastest resale when you move on. The rational first Birkin.
Buy the 35 if…
You want maximum bag for the money and plan to keep it. Pay attention to condition and colour — they decide whether a 35 resells at all.
Whichever size you choose, the other variables still matter: colour, leather, hardware and the production year stamp. Current market pricing for specific configurations is in our 2026 Birkin price guide.
Compare Real Offers by Size
Our curated collection lists authenticated Birkin 25, 30 and 35 pieces with transparent pricing — every bag physically inspected before listing.