Catalog note: Album entries can change. Use the live album link and WhatsApp to confirm the current option before ordering.
The YSL LouLou comes in four sizes — Toy (about 18.5 x 14 x 7 cm), Small (23 x 18 x 9 cm), Medium (30 x 23 x 11 cm), and Large (35.5 x 25.5 x 13.5 cm). The Small fits a phone, card holder, keys, and a compact; the Medium takes a full-size wallet and a small pouch. The Toy is the only size with a leather strap — Small and up use an adjustable chain.
The Saint Laurent LouLou is the house’s soft, padded Y-quilted shoulder bag, introduced in 2017 and named after Yves Saint Laurent’s muse, Loulou de la Falaise. If you are trying to pick a size, the four tiers — Toy, Small, Medium, and Large — are not subtle: they step up roughly 5 cm at a time, and the jump from Toy to Small is the biggest change in how the bag works.
The single most useful thing to know is the strap. The Toy is the only size with a leather strap. From the Small up, the strap is an adjustable chain that doubles for shoulder carry and extends single-length for crossbody.
Size at each tier
| Size | Dimensions (W x H x D) | Strap | What fits |
|---|---|---|---|
| Toy | 18.5 x 14 x 7 cm | Removable leather strap | Phone, card holder, keys, lipstick |
| Small | 23 x 18 x 9 cm | Adjustable chain | Phone, card holder, keys, compact |
| Medium | 30 x 23 x 11 cm | Adjustable chain | Full-size wallet, small pouch, extras |
| Large | 35.5 x 25.5 x 13.5 cm | Adjustable chain | Slim laptop, wallet, folded scarf |
The numbers are width by height by depth, and the padding means the bag keeps a soft, rounded shape whether it is full or nearly empty. That is the LouLou’s signature: it slouches naturally against the body instead of holding a rigid outline.
Which size to choose
- Toy — a true mini for evenings and essentials-only carry. It reads as a statement piece more than a daily bag.
- Small — the classic. It fits the essentials and moves from dinner to a desk without looking oversized.
- Medium — five centimetres wider and two deeper than the Small, which is more than it sounds. Pick it if the Small has ever felt tight.
- Large — a working bag that takes a slim laptop and a folded scarf. The Y-quilt looks softer at this scale, so it slouches more when not full.
LouLou vs Kate at a glance
The LouLou is often compared to the YSL Kate, and the two are opposites in hand-feel. The LouLou is padded, soft, and forgiving; the Kate is flat, structured, and precise. In size terms the LouLou is consistently roomier — a LouLou Small (23 x 18 x 9 cm) is noticeably bigger than a Kate Small (20 x 12.5 x 5 cm) — so if capacity matters, the LouLou wins at every tier.
What photos can and cannot prove
Photos can confirm the Y-quilted chevron, the strap type (leather vs chain), and roughly how the bag sits on the body. What they cannot confirm is the exact size, because the four tiers photograph very similarly at a distance. Send the model name and your preferred size on WhatsApp and ask for a measurement photo and a shot of the strap before you commit.
Bottom line
For most buyers the Small is the sweet spot — room enough for the essentials, and the chain straps that work for shoulder or crossbody. Move up to the Medium for a full-size wallet, down to the Toy for evenings.
Tell us which size you are leaning toward on WhatsApp with the model or a screenshot, and we will send current photos and confirm the size, leather, hardware, and strap type before you commit. Browse the Saint Laurent gallery for current photos, or open the Bags Catalog to see every brand album.
Frequently asked questions about the YSL LouLou bag
- What are the YSL LouLou bag sizes?
- Four sizes: Toy (about 18.5 x 14 x 7 cm), Small (23 x 18 x 9 cm), Medium (30 x 23 x 11 cm), and Large (35.5 x 25.5 x 13.5 cm). The Toy is the mini version with a removable leather strap; the Small and larger sizes have an adjustable chain shoulder strap.
- Does the LouLou Small have a chain or leather strap?
- The Small and larger sizes use an adjustable chain shoulder strap that can be worn single or doubled. Only the Toy LouLou uses a removable leather strap. The chain is a shoulder strap on every size and converts to a double chain on the Small and above.
- What fits in a LouLou Small bag?
- At about 23 x 18 x 9 cm, the Small holds a phone, a card holder, keys, and a compact. The quilting keeps its shape whether it is full or nearly empty. If that ever feels tight, the Medium adds about 5 cm of width and 2 cm of depth.
- Is the LouLou bigger than the YSL Kate?
- Yes, at the same tier. A LouLou Small is about 23 x 18 x 9 cm while a Kate Small is about 20 x 12.5 x 5 cm. The LouLou is a padded, roomier shoulder bag; the Kate is a flatter, structured envelope bag.
- Can photos tell me which LouLou size a listing is?
- Photos can show whether a bag is the quilted LouLou and roughly how large it reads on the body, but the four sizes photograph very similarly. Ask for a measurement photo against a ruler and the strap type (leather vs chain) to confirm the size before you commit.
