Underarm Bag Guide: The Baguette, Crescent and Half-Moon for B2B Buyers

The underarm bag — also called a baguette bag, half-moon bag, or crescent bag depending on its specific silhouette — is one of the most commercially important bag categories of the mid-2020s. After years on the periphery of the wholesale market, the format broke into mainstream commercial relevance around 2022–2023 and has maintained strong sell-through across boutique, department store, and e-commerce channels through 2026. Understanding what drives this performance, and which specific underarm bag formats translate best at wholesale, is essential for buyers building collections for the current market.

This guide covers the three main underarm bag silhouettes — baguette, crescent/half-moon, and mini underarm — along with material considerations, commercial performance by retail channel, and sizing specifications for production orders. For related sizing guidance on other bag categories, see our crossbody bag sizing guide and tote bag size guide.

What Defines the Underarm Bag Category

The unifying characteristic of all underarm bags is their carry method: the bag is tucked under the arm rather than worn on the shoulder or carried in the hand. This carry position creates specific design constraints — the bag must be narrow enough to tuck comfortably, long enough to rest against the body without slipping, and light enough to carry comfortably without a strap for short periods.

Most underarm bags also include a secondary strap — typically a slim chain or leather strap — that allows crossbody or shoulder carry when the tucked carry becomes impractical. This dual-carry functionality is one of the key reasons for the category's commercial strength: it works as an underarm bag for styling purposes and as a crossbody for practicality.

The Baguette Bag: The Original Underarm Silhouette

The baguette — named for the French bread it resembles in its elongated rectangular shape — is the definitive underarm bag silhouette. It is characterized by its horizontal orientation (significantly wider than tall), compact depth, and typically a single strap or chain. The baguette became a cultural icon in the late 1990s and has experienced several major revival cycles, the most recent of which began around 2022 and shows no signs of fading in 2026.

Standard baguette dimensions: W24–32cm × H12–16cm × D4–8cm. The length-to-height ratio (typically 2:1 or greater) is the defining visual characteristic — a bag that is too square loses the baguette silhouette. For production specifications, maintain this ratio carefully, as deviations of even 2–3cm at the height dimension significantly change the bag's visual read.

The baguette performs best in materials with some body — it needs to hold its horizontal shape when worn, which means very soft or unstructured leathers require internal stiffening. Mid-weight top-grain cowhide, pebbled leather, and quality PU are the strongest baguette materials commercially. Suede baguettes work but require more careful specification to maintain shape.

The Crescent and Half-Moon Bag

The crescent and half-moon bags share the baguette's underarm carry position but replace the rectangular silhouette with a curved, C-shaped or semicircular form. The curved base creates a more organic, less structured aesthetic that aligns well with current minimalist and quiet-luxury fashion currents.

Standard crescent dimensions: W28–38cm at widest point × H14–20cm at tallest point × D4–8cm. The curve radius varies from shallow (almost rectangular with rounded corners) to pronounced (a genuine half-circle). More pronounced curves create stronger visual impact but are more challenging to keep organized inside, as the curved base means contents tend to settle at the lowest point of the C-shape.

The crescent and half-moon formats have particularly strong performance in the Gen-Z and millennial demographic segments, driven by their distinctive silhouette and strong social media photography performance. The curved form creates interesting shadow and light play in images that photographs exceptionally well on e-commerce platforms and social media — a commercial advantage that should not be underestimated when evaluating which formats to include in a collection.

The Mini Underarm Bag

Mini underarm bags (W15–22cm × H10–14cm) carry phone, cards, and keys only. Their commercial proposition is almost entirely styling-driven rather than functional — they are worn to complete an outfit rather than to transport daily essentials. This occasion-driven purchase dynamic gives mini underarm bags strong performance in boutique and specialty retail channels where fashion-forward consumers are willing to invest in a bag that serves an aesthetic purpose.

The mini underarm format has the strongest impulse-purchase dynamics of any underarm bag category and is therefore effective as an add-on item in a broader collection rather than a standalone hero piece. At retail prices of $80–$150, the mini underarm bag is a strong gifting proposition and a natural complement to larger everyday bag purchases.

Material Performance in Underarm Bag Production

Material choice for underarm bags needs to balance shape retention with appropriate weight. The bag is held against the body by arm pressure rather than a strap — which means it must be light enough to carry without fatigue and structured enough to maintain its form when tucked.

• Pebbled top-grain cowhide: the strongest commercial material for underarm bags. Sufficient body for shape retention, durable, consistent quality. MOQ from 100 pcs from most mid-size factories.
• Smooth top-grain cowhide: clean aesthetic, very photogenic. Requires internal interfacing in the body panels to maintain shape. Good for premium positioning.
• High-quality PU vegan leather: effective in structured formats. Choose PU with a backing fabric layer rather than pure-PU — the fabric backing adds dimensional stability that helps the bag maintain shape during carry.
• Satin and velvet: for evening and occasion underarm bags. Typically require a rigid inner lining (cardboard or plastic sheet) to maintain shape. Seasonal performers with strong Q4 peak.

For more detail on material selection across bag types, see our comprehensive leather label guide and texture comparison guide.

Retail Channel Performance

Underarm bags perform strongest in boutique and specialty fashion retail, contemporary department stores, and fashion-forward e-commerce brands. They are less suitable for mass market retail, travel and functional accessory channels, or professional workplace contexts where practical carrying capacity is a priority.

The format's strongest seasonal performance is spring/summer, where lighter materials and the less encumbered carry style suit warmer weather. However, suede and velvet underarm bags in the crescent format have consistently strong autumn/winter performance in boutique channels — the category is genuinely year-round with seasonal material variation.