Magazine Carrier Buying Guide: Single vs Double Stack – How to Choose the Right Mag Pouch

Carrying a spare magazine is a cornerstone of responsible concealed carry. Whether you're a competitive shooter, a duty professional, or a civilian defender, having a reliable reload can make all the difference. But choosing the right magazine carrier can be surprisingly complex, especially when you're deciding between single and double stack configurations.

In this magazine carrier buying guide, we'll break down the key differences between single and double stack mag carriers, help you match the carrier to your firearm and carry style, and highlight some top-tier options from Guerrilla Tactical. By the end, you'll know exactly what to look for in a mag pouch for 9mm, .40, and other popular calibers.

Understanding Magazine Sizes: Single vs Double Stack

Before diving into carriers, it's essential to understand the magazines themselves. Single stack magazines are slim, typically holding fewer rounds (e.g., 6-8 rounds in a 9mm), and are popular for subcompact pistols designed for deep concealment. Double stack magazines are wider, holding more rounds (e.g., 15-17 rounds in a 9mm), and are standard in duty-sized handguns.

Your choice of magazine carrier should mirror your pistol's magazine type. Carrying a single stack mag in a double stack carrier can lead to a loose fit, while forcing a double stack mag into a single carrier can cause retention issues. That's why many carriers are specifically designed for either single or double stack mags, and some are even model-specific.

• Single stack: slim, lightweight, ideal for concealed carry and smaller calibers.
• Double stack: higher capacity, bulkier, suited for duty and competition.
• Always check compatibility with your exact magazine dimensions.

Carry Positions: IWB vs OWB

Your carry position plays a huge role in carrier selection. Inside-the-waistband (IWB) mag carriers offer superior concealment, keeping the mag closer to your body and reducing printing. They're ideal for everyday carry (EDC) and are often worn at the appendix or hip position.

Outside-the-waistband (OWB) carriers are more accessible and comfortable for open carry or range use. They allow for faster reloads and are often used in competition. However, they can be harder to conceal under light clothing. Some carriers, like the One Shot V2 - OWB, offer a secure fit with an active retention mechanism, making them a favorite among law enforcement and competitive shooters.

• IWB: best for concealed carry, offers maximum discretion.
• OWB: better for competition and duty, quicker access.
• Consider your typical attire and activity level.

Single Mag Carriers: Pros and Cons

Single mag carriers are the go-to choice for most concealed carriers. They're compact, lightweight, and easy to conceal, even under a t-shirt. They typically hold one magazine, which is sufficient for most defensive scenarios where a reload is rarely needed.

However, some shooters prefer the backup capacity of a double mag carrier. Single mag carriers are also more comfortable for all-day wear, as they don't create a large bulge on your belt. For a reliable single mag option, the Garage Sale One Shot V2 - OWB Fits Double Stack 9/40 is a great choice—it's designed for double stack mags but offers a slim profile that works well for OWB carry.

• Pros: lightweight, easy to conceal, comfortable for daily wear.
• Cons: limited spare ammo capacity.
• Ideal for EDC and backup reloads.

Double Stack Mag Carriers: Pros and Cons

Double stack mag carriers are designed for high-capacity magazines, typically used in duty pistols and competition guns. They offer the advantage of carrying more ammunition, which can be crucial in extended engagements or for shooters who prefer a heavier backup load.

The downside is increased bulk. Double stack carriers are wider and may print more easily, making them less ideal for deep concealment. However, for open carry, competition, or duty use, they are often the preferred choice. The Garage Sale Low Pro - Fits Glock 34/17/19 Gen 2-6 is an excellent example of a double stack carrier that balances capacity with a relatively low-profile design.

• Pros: higher ammo capacity, suitable for duty and competition.
• Cons: bulkier, more difficult to conceal.
• Ideal for those who prioritize capacity over concealment.

Key Features to Look For in a Magazine Carrier

When shopping for a magazine carrier, consider retention, adjustability, and material. Retention is critical—your mag should stay put during movement but be easily accessible when needed. Look for carriers with adjustable tension screws or active retention mechanisms.

Material matters too. Kydex offers a rigid, durable shell that resists wear and provides a consistent draw. Nylon and leather are softer but may wear out over time. Many carriers also feature a belt attachment that can be adjusted for cant (angle) and ride height, allowing you to fine-tune the draw angle for comfort and speed.

• Adjustable retention: ensures a secure fit for different magazine sizes.
• Cant adjustment: allows you to angle the carrier for a natural draw.
• Durable materials: Kydex and reinforced polymers offer longevity.

Top Picks from Guerrilla Tactical

Guerrilla Tactical offers a range of magazine carriers to suit different needs. For a versatile OWB option that handles double stack 9/40 mags, the Garage Sale One Shot V2 - OWB Fits Double Stack 9/40 is a solid choice. It features a low-profile design that works well for both range and carry.

If you're carrying a Glock 34/17/19, the Garage Sale Low Pro - Fits Glock 34/17/19 Gen 2-6 provides a secure fit with a minimal footprint. And for those who prefer to carry an extra mag in a stylish way, consider pairing your carrier with the Leisure Carry Belt System - TAN Topo v2, which offers a comfortable and sturdy platform for all your carry gear.

• Garage Sale One Shot V2: great for double stack 9/40, OWB.
• Garage Sale Low Pro: perfect for Glock 34/17/19, low profile.
• Leisure Carry Belt System: a comfortable base for your mag carriers.

Choosing between a single and double stack magazine carrier ultimately comes down to your personal carry style, firearm, and needs. For most concealed carriers, a single mag carrier offers the perfect balance of concealment and accessibility. If you're in the market for a reliable double stack mag carrier, check out the Garage Sale One Shot V2 - OWB Fits Double Stack 9/40—it's a great option that combines durability and performance. Visit Guerrilla Tactical today to find the perfect mag pouch for your setup.