Backpack Size Chart

Backpack sizes are measured in three ways depending on the bag type. Outdoor and hiking backpacks are measured by volume in liters and by torso length for harness fit. Laptop backpacks are measured by the maximum laptop screen size they accommodate (13″, 15″, 16″, 17″). Promotional, school, and general-purpose backpacks are measured by physical dimensions in inches (length x height x width). Understanding which measurement system applies to the backpack type you need is the first step before comparing sizes.

TLDR: Laptop backpacks: match the bag’s stated laptop size to your device’s screen diagonal. Outdoor daypacks: 10–30L for day use, 30–50L for overnight, 50L+ for multi-day. Drawstring packs: 8–12L standard. School backpacks: torso height + 4–6 inches of bag height. MFG Merch carries 12,000+ backpack models. Contact for a confirmed spec sheet on any style.

For branded backpack programs, the bag’s physical dimensions, laptop compatibility, and volume must all be confirmed before decoration artwork is built. A logo placement spec built on a 15″ laptop bag transferred to a 17″ laptop bag will sit in a different position relative to the zipper and pocket layout. Confirm the exact blank before finalizing artwork placement for any backpack program.

Key Takeaways

• Laptop size refers to screen diagonal, not bag dimension: A bag listed as “fits up to 15″ laptop” means the laptop sleeve accommodates a laptop with a 15-inch screen diagonal. The actual bag is larger than 15 inches. The sleeve dimension is typically 1–2 inches larger than the stated laptop size to allow for the laptop’s physical depth and padding.
• Volume in liters measures usable interior space: A 20L backpack has 20 liters of usable interior volume. This measurement includes all compartments combined. It does not tell you the physical dimensions of the bag, which vary by shape and design.
• Torso length determines outdoor harness fit: For hiking and outdoor packs, torso length (measured from C7 vertebra to iliac crest) determines whether the shoulder harness and hip belt sit at the correct positions. This measurement is irrelevant for laptop and school bags, which use adjustable straps with no torso-specific sizing.
• Branded promotional bags are sized by physical dimensions: Most promotional backpacks in the MFG Merch catalog list dimensions in inches (L x H x W) rather than liters. The physical dimensions determine how much can fit in the bag and what the bag looks like relative to a person’s back.
• MFG Merch carries 12,000+ backpack models: Because size specifications vary by manufacturer and style, contact MFG Merch for a confirmed size and spec sheet for any specific backpack in the catalog before placing a branded order.

Backpack Volume Guide: Liters by Use Case

Volume in liters is the standard measurement for comparing backpack capacity across brands. The table below covers the standard volume ranges for each use category, with the corresponding product examples from the MFG Merch catalog.

Laptop Backpack Size Chart

Laptop backpacks are sized by the maximum laptop screen diagonal they accommodate. The laptop size stated on the bag refers to the screen diagonal of the device, not the physical dimensions of the laptop sleeve. Actual sleeve dimensions are approximately 1–2 inches larger than the stated laptop size in both height and width to allow for the laptop’s physical body and the padding on the sleeve interior.

How to confirm laptop fit before ordering

Measure your laptop’s actual physical width and height (not the screen diagonal). Compare against the bag’s sleeve dimensions, not the stated laptop size. A laptop with a 15-inch screen diagonal may have a physical body that is 13.7 inches wide and 9.5 inches tall. The sleeve must be larger than these physical dimensions for the laptop to fit with the lid closed.

Backpack Physical Dimensions Chart

Physical dimensions (length x height x width, in inches) determine how large the bag looks when worn and how much it can physically hold. Two bags with the same stated volume in liters can have different physical dimensions if one is taller and narrower while the other is shorter and wider. For branded programs where the bag will be printed with a large logo, the height and width of the main panel determine the maximum print area.

Backpack Size by Type

Each backpack type has different sizing conventions and performance specifications. The right size for a branded program depends on the intended use, the target recipient, and the decoration space required.

Laptop backpacks

Laptop backpacks are sized primarily by laptop compatibility (13″, 15″, 16″, 17″) and secondarily by the number of additional compartments. For branded corporate programs, the 15″ and 16″ laptop sizes cover the vast majority of business laptops currently in use. A branded program that specifies a 15″ laptop bag will accommodate the most common corporate laptop sizes without requiring recipients to check compatibility. The 17″ format adds significant bag bulk and is primarily for users who carry large-format laptops or require extra storage for peripherals.

Drawstring backpacks

Drawstring backpacks are not sized by laptop compatibility or volume in the same way as structured backpacks. Standard adult drawstring backpacks measure approximately 14–18 inches tall x 12–14 inches wide and hold 8–15 liters. They are sized by bag dimensions and material weight rather than by volume or laptop fit. The most common promotional drawstring size is the one-size standard format used for event giveaways, school programs, and team sports bags. Mini drawstring bags for children run approximately 10–12 inches tall x 9–11 inches wide.

School backpacks

School backpacks are sized by the student’s age and torso height. The bag’s height should not exceed the student’s back from shoulder to hip. The table below provides school backpack sizing by age group.

Outdoor and hiking backpacks

Outdoor backpacks sized in liters follow a use-case hierarchy: 10–20L for summit packs and minimal day hikes, 20–35L for full-day hikes and light overnight, 35–50L for overnight to 3-day trips, and 50L+ for extended multi-day expeditions. Torso length determines which S/M/L harness size fits correctly. Most catalog outdoor packs (Osprey, High Sierra, EPEX, Koozie) are sized for adult torsos with adjustable straps rather than discrete torso size categories.

Cooler backpacks

Cooler backpacks are sized by the number of cans they hold at standard can size (12 oz / 355 ml). The catalog includes multiple cooler backpack formats.

Backpack Torso Sizing for Outdoor Packs

Outdoor and hiking backpacks with structured harnesses require torso length measurement for correct fit. Torso length is the distance from the C7 vertebra (the prominent bone at the base of the neck) to the iliac crest (the top of the hip bones). This is not the same as overall height or pants inseam.

How to measure torso length

Stand relaxed with arms at sides. Locate the C7 vertebra by tilting the head forward until the prominent bone at the base of the neck is visible. Measure from that point straight down the spine to the iliac crest (place hands on the hips to find the top of the hip bones). That measurement is the torso length. Most adult outdoor packs adjust to fit a torso range rather than requiring a specific size.

Branded Backpack Programs at MFG Merch

MFG Merch carries over 12,000 backpack models across laptop, drawstring, school, general, sling, cooler, and specialty formats from brands including Osprey, Timbuk2, High Sierra, American Tourister, MiiR, Vertex, KAPSTON, New Balance, Moleskine, Koozie, Igloo, and more. Bag specifications (including physical dimensions, laptop compatibility, volume, material, and imprint area) vary by model and manufacturer.

Because exact dimensions differ across the catalog, the correct approach for any branded backpack program is to identify the use case and recipient profile first, then contact MFG Merch to confirm the specific bag’s dimensions and imprint area before artwork is finalized. View the full range through the MFG Merch promotional materials catalog.

For corporate fulfillment programs where backpacks are part of an onboarding kit or event package, the MFG Merch fulfillment program handles storage, kitting, and individual recipient shipping alongside the backpack order.

Ready to build your backpack program? Start your custom backpack order and the production team will confirm the right size, style, decoration placement, and minimum quantities for your program.

Get the Latest Backpack Size Chart

Backpack dimensions, laptop compatibility, and volume specifications change when manufacturers update their designs. The information in this guide reflects current catalog listings and general industry standards. Always confirm the specific bag’s dimensions and laptop sleeve size against the current product listing before finalizing artwork or placing a production order. Contact MFG Merch for a confirmed spec sheet on any backpack in the catalog.

FAQ

How do I find my backpack size?

The sizing input depends on the backpack type. For laptop backpacks, match your laptop’s screen diagonal to the bag’s stated laptop size. A 15″ laptop requires a bag rated for at least 15″. For outdoor and hiking packs, measure your torso length from C7 to iliac crest and match to the harness size chart. For school bags, select a bag height that does not exceed the student’s back height from shoulder to hip. For drawstring and general-purpose bags, size is typically one adult standard; confirm physical dimensions if the bag must carry specific items.

What does backpack size in liters mean?

Liters in backpack sizing measure the total usable interior volume across all compartments. A 20L backpack has 20 liters of space. This is a capacity measurement, not a physical dimension. Two 20L bags from different manufacturers can have completely different physical dimensions because one may be taller and narrower while the other is shorter and wider. Volume tells you how much you can fit; physical dimensions tell you how large the bag is when worn and whether it fits specific items such as a 16-inch laptop.

What backpack size fits a 15-inch laptop?

Any backpack rated as “fits up to 15″ laptop” or “fits up to 16″ laptop” will accommodate a standard 15-inch laptop. The sleeve is sized for the laptop’s physical body (typically around 13.5 inches wide and 9.5 inches tall for a 15-inch screen diagonal) plus padding clearance. If your 15-inch laptop is a thicker model, confirm the sleeve depth (front-to-back clearance) as well as the height and width. Most 15″ sleeves have at least 0.75–1 inch of depth clearance for standard-thickness laptops.

What is the best backpack size for a corporate gift program?

For a corporate gift or employee onboarding program, the most versatile format is a 15″ or 16″ laptop backpack in the 20–30L range. This size fits the most common business laptops, accommodates a day’s essentials without being oversized, and has enough panel area for a prominent embroidered or screen-printed logo. Brands like Timbuk2, Osprey, MiiR, High Sierra, and Travis & Wells position well as premium corporate gifts because the brand recognition adds perceived value alongside the MFG Merch decoration.

What is the difference between a sling bag and a backpack?

A sling bag is worn across one shoulder with a single adjustable strap, while a backpack is worn on both shoulders with two straps. Sling bags in the catalog (Vertex Brooklyn Tech Sling, McKinley Laptop Sling, KAPSTON Jaxon Slingpack, KAPSTON Natisino Recycled PU Sling, KAPSTON Town Square Slingpack) are sized by the maximum laptop or tablet they accommodate and by the bag’s physical dimensions, following the same sizing conventions as laptop backpacks. The key distinction for branded programs is that sling bags have a narrower imprint panel than standard backpacks of equivalent laptop size, because the single-shoulder design produces a thinner bag profile.