Hermès Birkin sizing is refreshingly logical: the number is the bag’s width in centimetres. Choosing between them, though, is about how you carry, what you carry, and — for many buyers — how each size performs as an investment. This guide gives the real dimensions, weights, 2026 retail prices and resale realities of every mainstream size (and why they cost so much), then helps you choose.
Birkin sizes at a glance
| Size | Dimensions (W×H×D) | Handle drop | Weight | 2026 US retail (Togo) |
|---|---|---|---|---|
| Birkin 25 | ~25 × 20 × 13 cm | ~9 cm | ~1 lb | $13,500 |
| Birkin 30 | ~30 × 22 × 16 cm | ~11 cm | ~1.5 lb | $14,900 |
| Birkin 35 | ~35 × 25 × 18 cm | ~12 cm | ~2 lb | $16,300 |
| Birkin 40 | ~40 × 30 × 21 cm | ~13 cm | ~2.5 lb | $20,300 |
Note the pattern: 5 cm of width between each size, with height, depth, weight and price rising in step. Empty weight roughly doubles from the 25 to the 40, and a loaded 40 can approach 5 lb.
Birkin 25 — the icon
At ~25 × 20 × 13 cm the 25 is an essentials-only size: compact wallet, phone, keys, a small pouch. It is the most in-demand Birkin in the world, and the numbers show it — brand-new 25s regularly transact at 1.5 to over 2× retail, with standard-leather examples asking around $24,000 pre-owned against $13,500 retail. If you carry little and want the strongest resale, this is the one. Full detail: Birkin 25 guide.
Birkin 30 — the everyday sweet spot
The 30 (~30 × 22 × 16 cm) is the classic all-day choice: it holds a full day’s essentials plus a small tablet, without looking oversized. It rivals the 25 for demand — pristine 25s and 30s in Togo trade around $28,000–$30,000, roughly 2.4× retail. See what fits in a Birkin 30.
Birkin 35 — the workhorse
The 35 (~35 × 25 × 18 cm) adds room for a tablet, a larger wallet and the busy-day extras. Interestingly, it trades at or only slightly above retail on the secondary market — which makes it, along with the 40, the value pick if you want the most bag for your money rather than the biggest premium.
Birkin 40 — the original, roomy and unisex
The 40 (~40 × 30 × 21 cm, $20,300 retail) fits a 13″ laptop and A4 documents and doubles as a chic carry-on. With lower circulation and a narrower buyer pool it carries a more modest resale premium — again, more bag for the money. See what fits in a Birkin 40, and if you like height and structure, compare the taller HAC.
Retail vs resale: the size that holds value
Here is the counter-intuitive truth every buyer should know: the 35 and 40 cost more at retail (they use more leather) but do not automatically cost more pre-owned. Demand concentrates on the smaller 25 and 30, which command the biggest premiums (up to ~2.4× retail), while the 35 and 40 often sell near retail. So the “best value” depends on your goal: buy a 25/30 for resale strength, a 35/40 for maximum bag per dollar. Our resale value guide goes deeper.
A note on buying: the Birkin is a quota bag
Unlike the HAC, the Birkin is a quota bag — Hermès limits each client to a small number per year (commonly understood as about two), allocated only to clients with a valued purchase history. You cannot simply walk in and buy your size and colour; new Birkins require a boutique relationship, or you buy pre-owned from an authenticated reseller.
How to choose your size
- Carry little, want the icon and best resale? The 25.
- One do-everything bag? The 30.
- Carry a tablet and more, want value? The 35.
- Want presence, travel capacity or a unisex bag? The 40 — then consider the HAC.
Frequently asked questions
What do Birkin numbers mean?
The number is the width of the bag in centimetres — a Birkin 30 is about 30 cm wide.
How much does a Birkin cost in 2026?
US retail (Togo) is about $13,500 (25), $14,900 (30), $16,300 (35) and $20,300 (40) — but the most wanted sizes sell well above that pre-owned.
Which Birkin size holds value best?
The 25 and 30 command the biggest resale premiums (up to ~2.4× retail); the 35 and 40 tend to trade nearer retail.
What is the best everyday Birkin size?
The 30 is the classic all-day choice; the 25 if you carry little, the 35 if you carry more.
Can I just buy a Birkin in a boutique?
Not usually. The Birkin is a quota bag allocated to established clients; most buyers without a boutique relationship purchase pre-owned from authenticated resellers. See how to buy a Birkin.
