Saint Laurent lists YSL bag dimensions in centimeters, and matching the right size to your daily carry is the difference between a bag you use constantly and one that stays in the dust bag. As a quick reference, Loulou Small is about 25 x 17 x 9 cm (9.8 x 6.7 x 3.5 in), Envelope Medium about 24 x 17.5 x 6 cm (9.4 x 6.9 x 2.4 in), and Sac de Jour Small about 32 x 25 x 15.5 cm (12.6 x 9.8 x 6.1 in). Treat every figure as a starting point and confirm the exact numbers for the leather and season you are considering.
What are the YSL bag dimensions by model?
Measurements below are approximate and rounded to the nearest half centimeter. Saint Laurent shifts them slightly between leathers, hardware generations, and collection years.
YSL Loulou dimensions
- Toy: 20 x 14 x 7.5 cm (7.9 x 5.5 x 3 in)
- Small: 25 x 17 x 9 cm (9.8 x 6.7 x 3.5 in)
- Medium: 32 x 22 x 11.5 cm (12.6 x 8.6 x 4.5 in)
YSL Envelope dimensions
- Small: 21 x 13.5 x 6 cm (8.3 x 5.3 x 2.4 in)
- Medium: 24 x 17.5 x 6 cm (9.4 x 6.9 x 2.4 in)
- Large: 31 x 22 x 7.5 cm (12.2 x 8.7 x 3 in)
YSL Sac de Jour dimensions
- Nano: 22 x 17 x 11 cm (8.7 x 6.7 x 4.3 in)
- Baby: 26 x 20 x 12.5 cm (10.2 x 7.9 x 4.9 in)
- Small: 32 x 25 x 15.5 cm (12.6 x 9.8 x 6.1 in)
YSL Kate and Niki dimensions
- Kate Small: 20 x 12.5 x 5 cm (7.9 x 4.9 x 2 in)
- Kate Medium: 24 x 14.5 x 5.5 cm (9.4 x 5.7 x 2.2 in)
- Cassandre chain wallet: 22.5 x 14 x 4 cm (8.9 x 5.5 x 1.6 in)
- Niki Medium: 28 x 20 x 8.5 cm (11 x 7.9 x 3.3 in)
How do you measure a YSL bag correctly?
Measuring a bag you already own takes about two minutes and a soft tape. Use the same method retailers use so your numbers are comparable.
Ultimate Buying Guide for Replica YSL Bag: Length, Width, Height
- Lay the bag flat on a table with the strap tucked out of the way.
- Measure width across the widest point of the base, not the top opening.
- Measure height from the base seam to the highest point of the body, excluding the strap and any top handle.
- Measure depth at the base with the bag relaxed, not squeezed shut.
- Measure strap drop from the highest point of the strap down to the bag opening.
Which YSL size fits your daily carry?
Width matters less than depth when you carry a phone, cardholder, keys and sunglasses together. A bag under 6 cm deep rarely closes comfortably once a full-size wallet goes inside.
- Toy and Small sizes hold a phone, cardholder, keys and lipstick, and work best as evening or weekend bags.
- Medium sizes add room for a compact wallet, sunglasses case and a small water bottle.
- Sac de Jour Small and larger fit a 13-inch laptop sleeve, which makes them the practical work options.
Do YSL dimensions include the strap?
No. Published width, height and depth describe the body only. Strap drop is listed separately when it is listed at all, so check that figure if you plan to wear the bag crossbody.
Why do counterfeit YSL bags rarely match these dimensions?
Counterfeit makers work from photographs rather than production patterns, so widths, depths and strap drops drift by a centimeter or more. A Loulou Small copy often measures 26 to 27 cm across, which changes how the bag hangs against the body and how much it holds. Because measurements vary that much, dimensions alone can never confirm authenticity, and counterfeit goods carry legal and quality risks that outweigh any short-term saving.
Where should you check dimensions before buying?
The official Saint Laurent product page is the only reliable source, because it reflects the current season and the exact leather and hardware combination. Resale listings often copy older measurements, so ask the seller for a fresh tape photo of the base, height and strap drop. If the numbers differ from the official listing by more than a centimeter, treat that as a red flag.