Saint Laurent bag sizes are published by model, not by a universal chart, so the fastest path to the right fit starts with the model you already have your eye on: Loulou, Sac de Jour, Envelope, or Sunset. Every size within those families is measured as width by height by depth, and the dimensions below tell you exactly what each one holds. Pick your model, then hold your wallet and phone up to the numbers before you commit.
TL;DR:
- The Loulou bag sizes range from Toy (5.5” H) to Large (10.5” H), with the most popular being Small and Medium for daily use, and exact dimensions vary by production year.
- Sac de Jour sizes include Nano to Medium, with depth playing a key role in capacity; the Small fits an 11-inch tablet comfortably, while the Medium suits a laptop or overnight essentials.
- Envelope and Sunset models are smaller, built for evening and slim daytime carry, with Sunset Medium being the most versatile and Large capable of holding a slim tablet.
- Accuracy of size depends on checking specific interior width and depth measurements, not just overall dimensions, especially on resale or ambiguous listings.
- Bag weight varies by model, with smaller sizes like Toy Loulou being under a pound, while structured models like Sac de Jour are heavier and may impact comfort during long carry.
Table of Contents
- What Are the Loulou Bag Sizes?
- What Sizes Does the Sac De Jour Come In?
- How Big Are the Envelope and Sunset Bags?
- How Do You Choose the Right Saint Laurent Bag Size?
- How Much Do Saint Laurent Bags Weigh?
- Do Strap Lengths Change With Bag Size?
- How Do Saint Laurent Sizes Compare to Other Bags?
- How Camila Verified These Saint Laurent Bag Sizes
- Find Your Perfect Saint Laurent Fit With Naise Shopper
- Sources
- FAQ
What Are the Loulou Bag Sizes?
The Loulou comes in four sizes, and the jump between them is bigger than you’d guess from photos alone. According to PurseBlog’s Loulou guide, the lineup runs like this:
- Toy (sometimes labeled Mini): 5.5″ H × 7.8″ W × 2.7″ D (14 × 20 × 7 cm)
- Small: approximately 6.6 inches high by 9.8 inches wide by 3.5 inches deep
- Medium: 10.5″ H × 12.5″ W × 4.3″ D (27 × 32 × 11 cm)
- Large: 10.5″ H × 14.8″ W × 5.5″ D (27 × 38 × 14 cm)
The Toy Loulou is strictly a phone, card case, and lip balm situation. Small fits a phone plus a slim wallet with room to spare, while Medium is where a compact tablet or a full-size wallet and sunglasses case start fitting comfortably. Large is the one editors reach for as a genuine everyday tote replacement.
Pro Tip: If you’re torn between Small and Medium, think about your wallet shape first. A long French wallet needs the extra 2.7 inches of height Medium offers; a card holder or mini wallet never notices the difference.
Worth flagging: several specialist guides, including Handbag, documented a Loulou dimension update reported in December 2024, with the Toy/Mini and Small/Medium measurements shifting slightly from earlier production runs. If you’re comparing a resale listing to a current retail page, check the year of manufacture before assuming identical capacity. The Small Loulou in light musk is a solid reference point for current sizing if you want to see the numbers on an actual product.
What Sizes Does the Sac De Jour Come In?
The Sac de Jour ladder runs from Nano up through Baby, Small, and Medium, and this is the family where depth does more work than width. Per Coveti’s Sac de Jour size guide, reported measurements include:
- Nano: roughly 8.6″ W × 7.1″ H × 4.1″ D (22 × 18 × 10.5 cm)
- Baby: approximately 10.6″ W × 8.3″ H × 5.5″ D (27 × 21 × 14 cm)
- Small: roughly 12.6 inches wide by 10 inches high by 6.1 inches deep
- Medium: near 14.2 inches wide by 11 inches high by 6.7 inches deep
Two bags with near-identical width can carry very differently once depth and the accordion sides get involved. That’s the real story with this bag: the structured base and expanding sides mean a Small can swallow a tablet and a slim water bottle where a similarly wide tote from another brand couldn’t.
Pro Tip: Don’t judge Sac de Jour capacity from the front-facing width alone. Ask for the depth measurement specifically, since that’s what determines whether your daily items actually sit flat or get squeezed sideways.
Small is the size most people land on for daily work use, since it clears an 11-inch tablet with room for a cardholder and keys. Medium steps up to laptop territory or overnight essentials. LuxeFront’s complete Sac de Jour guide notes that larger duffle-style variants sometimes appear on non-U.S. retailer sites but aren’t always listed on American pages, so confirm availability before assuming a size exists in your market. The black calf leather Sac de Jour is a useful reference for checking current Small and Medium proportions in person.
How Big Are the Envelope and Sunset Bags?
Envelope and Sunset solve different problems. Envelope is built for evening and slim daytime carry, while Sunset flexes between both depending on size.
- Envelope Small: roughly 9.4″ W × 6.3″ H × 2.4″ D, fitting a phone, cards, and a lipstick with almost no extra room
- Envelope Medium: closer to 9.8″ W × 7.1″ H × 2.8″ D, enough for a compact wallet and sunglasses folded flat
- Sunset Small: approximately 9.4″ W × 6.7″ H × 3.1″ D
- Sunset Medium: around 10.6″ W × 7.9″ H × 3.5″ D
- Sunset Large: roughly 12.2″ W × 9.4″ H × 4.3″ D
According to Fashionphile’s breakdown of Sunset styles and sizes, the Medium is the most versatile of the three, transitioning from desk to dinner without feeling like either a clutch or a work bag. Small Sunset and both Envelope sizes read as evening pieces the moment you add a chain strap and shorten the drop. Large Sunset is the pick if you want the flap silhouette but need it to function all day, since it’s the only size in either family that comfortably holds a slim tablet alongside your wallet.
How Do You Choose the Right Saint Laurent Bag Size?
Skip the guesswork and run through this before you buy:
- Lay out what you actually carry daily. Phone, wallet, keys, sunglasses case, maybe a slim water bottle. Measure the bulkiest two or three items, not the whole pile.
- Match those measurements against interior width and depth, not just the overall listed size. A bag that looks roomy in photos can still be too shallow for a rounded sunglasses case.
- Factor in strap drop and how you want to wear it. A shoulder bag with a short drop rides differently than one meant for crossbody wear, and that changes how bulky the bag can feel even at the same dimensions.
- Run a quick verification check using a ruler or tape measure against a printed size chart before checkout, especially on resale platforms where photos can be misleading.
Pro Tip: Bring your actual wallet and phone to a boutique or authorized retailer and test them in the bag physically. Photos flatten depth, and depth is where most sizing disappointments happen.
If you’re still stuck between two adjacent sizes, size up. A slightly roomy bag ages better in your rotation than one you outgrow within a season.
How Much Do Saint Laurent Bags Weigh?
Weight matters just as much as footprint, especially for anyone who carries a bag crossbody for a full workday. The Toy and Mini Loulou sizes sit at the lighter end, typically under a pound empty, thanks to their compact hardware and minimal leather. Small Loulou and Envelope styles add a modest amount for the chain strap, landing in a range most people wear comfortably for hours.
Sac de Jour bags run heavier across the board because of their structured base and reinforced sides. The Small and Medium sizes carry noticeably more empty weight than a soft-sided Loulou of similar size, since the boxy silhouette needs internal support to hold its shape. Add a laptop or tablet to a Medium Sac de Jour and the total load climbs fast, which is worth remembering if you’re prone to shoulder or neck strain from heavy bags.
Sunset and Envelope sizes fall in the middle. The hardware, particularly the metal YSL plaque on Sunset, adds a bit of heft that’s noticeable when the bag is empty but less of a factor once it’s loaded with everyday items.
If weight is a genuine concern, don’t rely on size alone as a proxy. A compact structured bag can feel heavier on your shoulder than a larger soft one, simply because of leather thickness and hardware density. When possible, ask a retailer for the empty bag weight, or hold the bag loaded with your typical items before deciding.
Do Strap Lengths Change With Bag Size?
Strap drop varies meaningfully across the Saint Laurent lineup, and it’s easy to overlook until the bag is already on your shoulder. Smaller sizes like the Toy Loulou and Envelope Small typically come with a shorter chain drop, built for a snug underarm carry rather than a slouchy crossbody look. That shorter drop works fine for evening wear but can feel restrictive if you’re hoping to sling the bag across your body over a coat.
Medium and Large sizes generally offer a longer adjustable strap, or in some cases a two-way option with both a shoulder chain and a top handle. The Sac de Jour, for instance, is designed primarily as a handheld or crook-of-the-arm bag, so its strap options (where included) tend to be secondary rather than the main carry method.
If crossbody wear is non-negotiable for you, check the strap drop measurement before size. A Medium Loulou with a short strap can sit higher and tighter than a Small with a longer one, so the size name alone doesn’t guarantee the wearing style you want. Some models also offer adjustable chain links, which is worth asking about if you plan to layer the bag over bulky winter clothing part of the year and light layers the rest.
How Do Saint Laurent Sizes Compare to Other Bags?
Numbers on a spec sheet only mean so much until you put them next to something familiar. A Toy Loulou is close in footprint to a smartphone laid flat with an inch of margin on each side, which is exactly why it only fits the essentials. The Small Loulou is roughly the size of a standard paperback novel, and the Medium Loulou approaches the dimensions of a hardcover.
Against other brands, the comparisons get more useful for shoppers cross-shopping labels. The Gucci Marmont Mini sits close to the Toy Loulou in overall footprint, while the Gucci Marmont Small lands nearer to the Small Loulou, though the Marmont’s quilted structure tends to hold its shape more rigidly. A Small Sac de Jour is comparable in width to a small laptop sleeve for an 11 inch device, which explains why it’s the size most people reach for when they need to carry a tablet without carrying an obvious tech bag.
Sunset Medium and Large sizes land in similar territory to a mid-size crossbody from most other luxury houses, roughly the width of a standard hardcover book turned sideways. If you already own a bag in another brand that fits your daily items well, measuring it and matching that width and depth against the charts above is often faster than trying to visualize inches and centimeters cold.
How Camila Verified These Saint Laurent Bag Sizes
Getting handbag dimensions right takes more than trusting a single retailer’s product page, since brands occasionally update measurements without flagging the change clearly. This guide cross-referenced specialist sizing breakdowns, including PurseBlog’s Loulou documentation and Coveti’s Sac de Jour ladder, against current product listings to confirm the numbers held up in practice.
Naise Shopper’s own catalog, including its Sac de Jour handbag listing, served as an additional checkpoint for verifying current availability and images against published specs. When brand pages, retailer size charts, and specialist guides all agree, that’s a strong signal the numbers are current and accurate.
— Camila
Find Your Perfect Saint Laurent Fit With Naise Shopper
Once you know the exact size you want, the harder part is finding it authenticated and at a discounted price instead of full retail. A trusted retailer exists for that gap, offering an authenticity guarantee so you’re never gambling on a size chart against a bag that might not be genuine.
Beyond authentication, some retailers offer personal shopper assistance for buyers who want help sourcing a specific size or color combination, plus secure international shipping with insurance included on qualifying orders. This service can be particularly helpful when you’re chasing a size that’s sold out locally or only available through certain markets, helping you track it down without navigating a foreign checkout process alone. Browse the current Saint Laurent handbag selection to compare in-stock sizes against the dimensions in this guide, and reach out for personal shopper help if the exact size you want isn’t listed yet.
Sources
FAQ
What size is 38 in a Saint Laurent bag?
Size 38 typically refers to a measurement in centimeters, most often seen on Sac de Jour or similar structured styles, and it usually denotes the width of the bag’s base. Always confirm whether the number refers to width, height, or a combination, since Saint Laurent doesn’t use one universal sizing scale across all models.
Does Saint Laurent fit true to size?
Saint Laurent handbags don’t follow a “true to size” concept the way clothing does, since each model has its own independent dimensions rather than a shared scale. The safest approach is comparing the exact width, height, and depth of the size you want against what you already carry daily, as detailed in the Loulou guide above.
What are the different types of Saint Laurent bags?
The core handbag families include Loulou, Sac de Jour, Envelope, and Sunset, each with its own size range and silhouette. Loulou is a quilted shoulder bag, Sac de Jour is a structured tote, and Envelope and Sunset both lean toward flap-style evening and crossover day bags.
What are the standard Loulou sizes?
The Loulou comes in four standard sizes: Toy (or Mini), Small, Medium, and Large. According to PurseBlog’s dimensions, Small measures about 6.6″ H × 9.8″ W × 3.5″ D, while Medium jumps to roughly 10.5″ H × 12.5″ W × 4.3″ D, a meaningful step up rather than a marginal one.
