When it comes to Hermès, it’s not just about craftsmanship, exotic leather, or rarity—it’s also about decoding a sophisticated sizing system that can easily confuse even seasoned collectors.
What does a Birkin 25 or Kelly 28 mean? What’s the difference between TPM and Mini? And how does size affect your daily use or long-term investment value?
This guide breaks down Hermès bag sizing in detail, so you can make confident, informed decisions whether you're investing or simply finding the perfect match for your lifestyle.
1. The Number-Based Sizing System – Birkin, Kelly, Bolide, Picotin…
Hermès typically uses centimeter-based naming to indicate the width of the bag's base.
▪️ Birkin Bag Sizes
| Size | Dimensions (cm) | Best For | Notes |
|---|---|---|---|
| Birkin 25 | 25 x 20 x 13 | Evening, petite frames, collectors | Highly sought-after |
| Birkin 30 | 30 x 22 x 16 | Everyday use, workwear | A timeless, safe choice |
| Birkin 35 | 35 x 25 x 18 | Functional daily carry | Slightly less trendy now |
| Birkin 40 | 40 x 30 x 21 | Travel, unisex styles | Rare and discontinued |
▪️ Kelly Bag Sizes
| Size | Dimensions (cm) | Best For | Style |
|---|---|---|---|
| Kelly 20 | 20 x 16 x 10 | Elegant events | Mostly Sellier |
| Kelly 25 | 25 x 19 x 9 | Versatile, everyday | Most popular |
| Kelly 28 | 28 x 22 x 10 | Work and classic styling | Timeless structure |
| Kelly 32 | 32 x 23 x 10.5 | Spacious classic lovers | Vintage appeal |
| Kelly 35 | 35 x 24 x 12 | Vintage collectors | Rarer in current production |
Note: Kelly bags come in two styles: Sellier (structured, sharp) and Retourne (softer, more casual).
▪️ Picotin Sizes
| Size | Name | Dimensions (cm) | Use |
|---|---|---|---|
| Picotin 18 | PM (Petit Modèle) | 18 x 19 x 13.5 | Minimal daily use |
| Picotin 22 | MM (Moyen Modèle) | 22 x 21 x 18 | Functional everyday bag |
2. Special Size Labels – Mini, TPM, Cut, Elan...
Some Hermès bags don't use the centimeter-number system. Instead, they’re identified by unique codes or abbreviations.
▪️ Mini Kelly (Kelly 20)
– Size: 20 cm
– Extremely popular, crossbody with long strap
– Mostly seen in Sellier form; Retourne is rare
▪️ Kelly Pochette & Kelly Cut
| Model | Dimensions (cm) | Ideal For | Notes |
|---|---|---|---|
| Kelly Pochette | ~22 x 13 x 7 | Elegant evening wear | Small handle |
| Kelly Cut | ~31 x 13 x 2.5 | Formal events, red carpet | Sleek clutch-style |
▪️ Constance
| Size | Dimensions (cm) | Details |
|---|---|---|
| Constance 18 | 18 x 15 x 4 | Compact crossbody |
| Constance 24 | 24 x 15 x 5 | Practical, structured |
| Constance Elan | 25 x 14 x 8 | Long, slim clutch style |
▪️ Evelyne Sizes: TPM / PM / GM
- TPM (Très Petit Modèle): ~16 cm
- PM: ~29 cm
- GM: ~33 cm
→ These are casual crossbody bags suitable for all ages and styles.
3. How Size Affects Value & Investment Potential
- Mini sizes (Kelly 20, Birkin 25, Constance 18) are highly sought-after due to their style and limited supply.
- Birkin 25 and Kelly 25 are currently the top performers in resale markets.
- Larger sizes (Birkin 35, Kelly 35) are less in demand today but still attract vintage lovers.
- With Picotin, the 18 cm version is typically more in-demand than the 22 cm.
- Mini bags like Mini Lindy, Mini Kelly, and Mini Evelyne TPM are almost impossible to find in-store and command high premiums.
4. How to Choose the Right Hermès Size for Your Needs
| Use Case | Suggested Sizes | Notes |
|---|---|---|
| Evening, luxury styling | Mini Kelly, Kelly Pochette, Kelly Cut, Constance 18 | Elegant, compact choices |
| Office & daily elegance | Kelly 28/32, Birkin 30, Picotin 22 | Balanced size and functionality |
| Casual & youthful | Evelyne TPM, Picotin 18, Mini Lindy | Light, sporty, versatile |
| Investment potential | Birkin 25, Kelly 25, Mini Kelly | Focus on rare leather & neutral colors |
Understanding Hermès sizing is essential—not just for practicality, but also for making a smart fashion investment. Whether you're stepping into the world of Hermès or expanding your collection, choosing the right size is a reflection of your personal style and sophistication.
Available Now at Maison de H
At Maison de H, we specialize in sourcing the most exceptional, rare, and collectible Hermès creations. Each Hermès bag is a masterclass in craftsmanship and elegance—and selecting the right size ensures it becomes an effortless extension of your wardrobe and lifestyle.
Whether you’re looking for a compact Kelly 20 or a spacious Birkin 35, we’re here to help you make a choice that’s both stylish and strategic.
Contact us or 👉 Shop Now to discover the Hermès bag that’s perfectly sized for you.