The Birkin and the Kelly are the two most iconic bags in the Hermès collection — and the two most sought-after pieces on the pre-owned market. If you are buying your first Hermès bag, the choice between them is the single most important decision you will make. Both bags share the same DNA — the same leathers, the same hardware, the same level of craftsmanship — but they serve different purposes, suit different wardrobes, and perform differently as investments.
This guide covers everything you need to make an informed decision: design, practicality, sizing, construction, pricing, investment performance, and ultimately which bag suits you best.
The History Behind Each Bag
The Kelly came first. Originally called the Sac à dépêches, it was designed in the 1930s as a saddle bag. In 1956, Princess Grace of Monaco was photographed carrying one to shield her pregnant belly from paparazzi, and Hermès renamed it the Kelly. That single image turned the bag into a symbol of aristocratic elegance — a reputation it carries to this day.
The Birkin is younger. In 1984, Jean-Louis Dumas, then chairman of Hermès, sat next to the actress Jane Birkin on a flight from Paris to London. She complained about not being able to find a leather weekend bag she liked. He sketched one on the back of an air sickness bag. That sketch became the Birkin — a relaxed, open-top tote designed for real life rather than red carpets.
These origin stories matter because they define the character of each bag. The Kelly is rooted in formality and restraint. The Birkin is rooted in ease and spontaneity.
Design and Silhouette
The Birkin is an open-top tote with two rolled top handles. It was designed for ease — you can reach in and grab what you need without unclasping anything. The bag sits upright, has a relaxed, slightly slouched profile in softer leathers, and projects an air of effortless daily luxury. The front flap folds over but does not need to be clasped during use. Many owners leave the straps untucked permanently.
The Kelly is a structured, single-handle bag with a flap closure secured by a turn-lock clasp and a detachable shoulder strap. It has a more formal, polished silhouette. The Kelly was originally designed as a saddlebag, and its architecture reflects that heritage — clean lines, a trapezoidal shape, and a sense of quiet discipline. When the flap is closed, the bag presents a perfectly composed exterior with no visible hardware except the turn-lock.
When worn, the bags create very different impressions. The Birkin hangs from two short handles at your side — casual, accessible, grounded. The Kelly can be carried by its single top handle for a more upright, ladylike look, or worn over the shoulder or crossbody with the strap for a more relaxed feel.
Everyday Practicality
The Birkin wins on accessibility. With no flap to open and close, it functions like a high-end tote. The interior is a single open compartment with one zipped pocket — simple, spacious and easy to navigate. You can drop things in and pull them out without thinking about clasps or closures.
The Kelly requires more deliberate use. The flap closure means accessing the interior takes a few extra seconds — you need to turn the lock, fold back the flap, and reverse the process when closing. For some, this is a drawback that makes the Kelly impractical for busy daily use. For others, it is part of the ritual — a moment of intention each time you open or close the bag.
In practice, many Kelly owners learn to leave the flap unclasped and simply tuck it in during the day, which largely eliminates the accessibility issue. But the Birkin remains the more naturally convenient bag for daily use.
Both bags are heavier than most people expect. A Birkin 30 in Togo leather weighs approximately 800 grams empty. A Kelly 28 Retourné weighs approximately 700 grams. By the time you add a wallet, phone, keys and cosmetics, the total weight is significant — worth considering if you carry your bag for extended periods.
Sizing Compared
The Birkin is available in four main sizes: 25, 30, 35, and 40 centimetres. The 25 is compact and works best as an evening or light-day bag — it fits a phone, card holder, keys and little else. The 30 is the most versatile daily size. The 35 is spacious but can feel bulky on smaller frames. The 40 is essentially a travel bag.
The Kelly comes in more sizes — 20, 25, 28, 32, and 35 — with the 25 and 28 being the most sought-after. The Kelly Mini (20 cm) has become one of the most desirable pieces in the entire Hermès range, driven by the trend toward smaller bags. The Kelly 28 is the closest equivalent to the Birkin 30 in terms of usable space, though the Kelly's trapezoid shape means the interior tapers toward the bottom, reducing effective capacity compared to the Birkin's more uniform box shape.
For the resale market, the Birkin 25 and Kelly 25 command the highest premiums relative to retail price. Larger sizes — particularly the Birkin 35 and above — trade at discounts to smaller versions.
Sellier vs Retourné (Kelly Only)
This is a distinction unique to the Kelly and it significantly affects both aesthetics and price. The Kelly comes in two constructions.
Sellier has exposed, topstitched seams and a rigid, architectural structure. The leather panels are stitched together with the seams facing outward, creating sharp, defined edges. The result is a more formal, sculptural bag that holds its shape firmly. Sellier Kellys are typically made in stiffer leathers like Epsom because the construction demands rigidity.
Retourné has turned-in seams and a softer, more relaxed shape. The leather panels are stitched together inside-out and then turned right-side-out, hiding the seams. The result is a bag with rounded edges and a gentle slump. Retourné Kellys work beautifully in soft leathers like Togo and Clemence.
On the resale market, Sellier commands a significant premium — often 20–40% above Retourné in equivalent condition, colour and leather. This premium reflects both the more limited production of Sellier and its status as the more desirable version among collectors.
If you are choosing between the two, Sellier is the stronger investment. Retourné is the more practical, forgiving bag for daily use.
Pricing: Retail and Resale
At UK retail in 2026, the Birkin 25 in Togo leather costs approximately £8,450. The Kelly 25 Retourné in the same leather costs approximately £8,250. The Kelly 25 Sellier costs approximately £9,200. Prices vary slightly by region and are subject to annual increases.
On the resale market, premiums vary significantly by size, colour, leather and condition. A store-fresh Birkin 25 in Noir Togo with gold hardware can trade at £12,000–£15,000. A Kelly Mini in Epsom can reach £15,000–£18,000. A Kelly 25 Sellier in a desirable colour can achieve £14,000–£17,000.
The key insight is that retail price is only the starting point. Resale value is determined by desirability — and desirability is driven by scarcity, colour and condition more than by model alone.
Investment Performance
Both bags are exceptional stores of value. Over the past decade, Birkin bags have appreciated approximately 92% on the resale market. Kelly bags have appreciated approximately 75% over the same period.
The Birkin has historically outperformed the Kelly by 2–4 percentage points per year. The Birkin 25 in classic colours and gold hardware is the single most liquid asset in luxury resale — it sells faster and at more consistent premiums than any other configuration.
However, the Kelly Mini and Kelly Sellier have closed the gap significantly in recent years. The Kelly Mini II now consistently trades at 200–280% of its retail price, making it one of the highest-performing Hermès bags in absolute terms. Certain Kelly Sellier configurations — particularly in seasonal or limited colours — now trade above equivalent Birkins.
For pure investment, the Birkin 25 remains the safest, most liquid choice. For potentially higher returns with slightly less liquidity, the Kelly Mini and Kelly Sellier 25 are compelling.
Which Should You Choose?
If you want a versatile everyday bag that works with jeans and a T-shirt or a tailored suit, choose the Birkin. It is easier to use, more casual in character, and universally flattering. The Birkin 30 is the ideal first purchase for daily use.
If you prefer a more structured, elegant bag that elevates any outfit and conveys a sense of polish, choose the Kelly. The Kelly 28 Retourné is the most versatile choice for daily wear. The Kelly 25 Sellier is the strongest investment play.
If you are buying purely as an investment, the Birkin 25 in a neutral colour — Noir, Gold, or Étoupe — with gold hardware remains the safest bet. If you want something with strong appreciation potential and a distinctive look, the Kelly Sellier 25 or Kelly Mini are excellent choices.
There is no wrong answer. Both bags are masterpieces of craftsmanship, both hold their value exceptionally well, and both will serve you for decades with proper care.
At JULL, we can source either bag in the exact specification you want — leather, colour, hardware, size. Send us a WhatsApp and we will begin your search.