21l Backpack

Backpacks for daily commutes, gym sessions, and travel.

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Gymreapers
CROCS US SHOP
Simple Modern
BAGSMART

Gymreapers

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Gymreapers Lifting Straps for Weightlifting Bodybuilding Powerlifting & Strength Training - Premium Padded Neoprene Deadlift Straps with 18" Cotton for Pull-ups Rows Shrugs Heavy Lifts & Gym Workouts - Grip Support & Wrist Protection Set of 2
$20.92
Gymreapers Infinity Seamless Gym Scrunch Shorts for Women 1 Pair Moisture Wicking Breathable Fabric Diamond Gusset Crotch Scrunch Back Two Tier Waistband High Waist Compression Fit Squat Proof Athletic Workout Shorts for Gym Training Fitness
$34.99(-13%)
Gymreapers Women's 3-Pack Infinity Seamless Scrunch Athletic Shorts, High Waistband, Moisture-Wicking, Breathable, Diamond Gusset Crotch, No Front Seam, Squat-Proof, Compression Fit, Stretch, Anti-Chafe Athleisure Sports Shorts for Gym Yoga Training
$84.00(-30%)
Gymreapers Women's Infinity Seamless High Waist Sports Bottoms, Ultra-Comfortable Moisture-Wicking 4-Way Stretch Skinny Leggings with Back Scrunch for Gym, Yoga Activewear
$44.99(-10%)
Gymreapers Griplink Lifting Straps with Cushioned Wrist Cuff 14.5" Cotton Strap Anti-Slip Silicone Beads 5mm Steel D-Ring for Free-Weight & Cable Training
$23.98
Gymreapers Halo Athletic Compression Shorts for Women - Seamless Knit Interlock Fabric for Breathability and Flexibility, Gym Training Shorts, High Stretch Shorts
$31.48(-25%)

Gravestone Training Bags - 65L Multi-Compartment Duffle, 35L Durable Backpack, 21L Hybrid Work/Gym Backpack, 22.5L Everyday Essential Tote Bag High Capacity Multifunctional Backpack Backpack For Traveling On Airplane Expandable Travel Backpack
Free shipping
Gymreapers

Gravestone Training Bags - 65L Multi-Compartment Duffle, 35L Durable Backpack, 21L Hybrid Work/Gym Backpack, 22.5L Everyday Essential Tote Bag High Capacity Multifunctional Backpack Backpack For Traveling On Airplane Expandable Travel Backpack

4.81.3K sold
-15%$80.99$95.00
21L Sporty Backpack Outdoor Backpack for Hiking, School & Travel Lightweight Casual Daypack

21L Sporty Backpack Outdoor Backpack for Hiking, School & Travel Lightweight Casual Daypack

$14.90
INUK WUUL 21L Water-Resistant Built-in Organizer Laptop Backpack - Commuting, College School Bag for Students, Built-In Organizer Backpacks

INUK WUUL 21L Water-Resistant Built-in Organizer Laptop Backpack - Commuting, College School Bag for Students, Built-In Organizer Backpacks

$42.99
Nike 21L Triple-Brand Backpack for Men and Women – Stylish Polyester Travel Bag in Classic Black

Nike 21L Triple-Brand Backpack for Men and Women – Stylish Polyester Travel Bag in Classic Black

$116.45
Nike Elemental 21L Casual Backpack for Men and Women with Front Print, Polyester, Khaki

Nike Elemental 21L Casual Backpack for Men and Women with Front Print, Polyester, Khaki

$108.56
The Iris Backpack (#9012) Expandable Unisex Backpack - By Iris & Rainbow
Free shipping

The Iris Backpack (#9012) Expandable Unisex Backpack - By Iris & Rainbow

4.839.6K sold
$50.49
Vanguard VEO City B46 21L Camera Backpack with Pouch
Free shipping

Vanguard VEO City B46 21L Camera Backpack with Pouch

$219.99
Senda 21L Backpack

Senda 21L Backpack

$135.00
42L Expandable Convertible Carry On Luggage Backpack - Water-Resistant Polyester Travel Daypack with 17-Inch Laptop Sleeve, USB Port, Organized EDC Gear for Men & Women, Laptop Duffel, Getaway Bag, Back to School Haul, Polyester Edit
Free shipping

42L Expandable Convertible Carry On Luggage Backpack - Water-Resistant Polyester Travel Daypack with 17-Inch Laptop Sleeve, USB Port, Organized EDC Gear for Men & Women, Laptop Duffel, Getaway Bag, Back to School Haul, Polyester Edit

4.61.1K sold
Flash sale
-50%$32.99$65.98
Moment Everything 21L Backpack
Free shipping

Moment Everything 21L Backpack

$150.00
PRVKE 21L in Wasatch Green

PRVKE 21L in Wasatch Green

$175.20
Lululemon Everyday 21L Backpack - Unisex Casual Style Black Small Carry On Casual Brand Logo Adjustable Buckle Backpack with Side Pockets, Adjustable Straps, Small Backpacks, Carry On Backpacks

Lululemon Everyday 21L Backpack - Unisex Casual Style Black Small Carry On Casual Brand Logo Adjustable Buckle Backpack with Side Pockets, Adjustable Straps, Small Backpacks, Carry On Backpacks

$298.23
Nike 21L Polyester Backpack for Men and Women – Unisex Green Style

Nike 21L Polyester Backpack for Men and Women – Unisex Green Style

$115.78
Nike 21L Logo-Zip Backpack for Men and Women – Recycled Polyester, Casual Style in Bean Green

Nike 21L Logo-Zip Backpack for Men and Women – Recycled Polyester, Casual Style in Bean Green

$145.54
Lululemon Everyday 21L Backpack for Men - Small Carry On Adjustable Multi-Compartment Backpack, Nylon Material, Side Pockets, Warm Taupe Gray, Small Backpacks, Carry On Backpacks

Lululemon Everyday 21L Backpack for Men - Small Carry On Adjustable Multi-Compartment Backpack, Nylon Material, Side Pockets, Warm Taupe Gray, Small Backpacks, Carry On Backpacks

$308.98
Vanguard VEO City B46 21L Camera Backpack with Pouch for Photographers
Free shipping

Vanguard VEO City B46 21L Camera Backpack with Pouch for Photographers

$219.99
Clear Backpack Heavy Duty Transparent Bookbag Teen Girlish Cute Bag Large Capacity See Through Backpacks Stadium Approved Daypack for Middle School College Sport/Travel

Clear Backpack Heavy Duty Transparent Bookbag Teen Girlish Cute Bag Large Capacity See Through Backpacks Stadium Approved Daypack for Middle School College Sport/Travel

4.9512 sold
$33.99
Crocs Spider-Man Classic Backpack
CROCS US SHOP

Crocs Spider-Man Classic Backpack

5.094 sold
$99.99
Simple Modern 18L Fletcher Kids' Backpack for Boys and Girls for School, Travel
Simple Modern

Simple Modern 18L Fletcher Kids' Backpack for Boys and Girls for School, Travel

4.92.7K sold
$54.99
MOSISO Women's Puffy Quilted Backpack, 15-15.6in Laptop Bag with 16in Expandable Carry On Design, USB Port, Built-In Pockets & Adjustable Multi-Compartment for College Work, Backpacks For Women, Carry On Backpacks

MOSISO Women's Puffy Quilted Backpack, 15-15.6in Laptop Bag with 16in Expandable Carry On Design, USB Port, Built-In Pockets & Adjustable Multi-Compartment for College Work, Backpacks For Women, Carry On Backpacks

4.931 sold
$35.99
Simple Modern 12L Fletcher Kids' Backpack for Boys and Girls for School, Travel
Free shipping
Simple Modern

Simple Modern 12L Fletcher Kids' Backpack for Boys and Girls for School, Travel

4.913.6K sold
$44.99
Crocs Classic Nylon Backpack, Ready to Personalize Travel and School Bag
Free shipping
CROCS US SHOP

Crocs Classic Nylon Backpack, Ready to Personalize Travel and School Bag

4.99.0K sold
$59.99
Crocs Classic Backpack, Ready to Personalize Travel and School Bag
Free shipping
CROCS US SHOP

Crocs Classic Backpack, Ready to Personalize Travel and School Bag

4.932.3K sold
$107.95
The Iris Mini Backpack (#9013) Portable Lightweight and Durable Material - By Iris & Rainbow
Free shipping

The Iris Mini Backpack (#9013) Portable Lightweight and Durable Material - By Iris & Rainbow

4.891.0K sold
Flash sale
$45.99
【NEW IN】BAGSMART Insulated Side Pocket 22L Backpack Stylish Casual Bag for Daily Travel School & Work Thermal Pocket Keeps Drinks Cold Hot tiktokshopsummersale tiktokshopbacktoschool
Free shipping
BAGSMART

【NEW IN】BAGSMART Insulated Side Pocket 22L Backpack Stylish Casual Bag for Daily Travel School & Work Thermal Pocket Keeps Drinks Cold Hot tiktokshopsummersale tiktokshopbacktoschool

4.91.3K sold
-13%$39.99$45.99
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Introduction

21L backpacks balance capacity and portability for everyday use.

  • Structured compartments keep laptops, notebooks, and gym clothes organized.
  • Adjustable straps and breathable back panels improve comfort during long wear.
  • Water-resistant fabrics protect contents from light rain and spills.

Find the right 21L backpack for your routine.

FAQs

A 21L backpack typically holds a 15-inch laptop, a change of clothes, a water bottle, and small accessories without overstuffing.

Most airlines accept 21L backpacks as personal items when they meet size limits, usually under 18 x 14 x 8 inches.

Spot-clean with mild soap and a soft brush, then air-dry completely. Remove any electronics before washing.

Many 21L models include a hydration sleeve and tube routing for hands-free drinking during hikes or bike rides.

Reinforced stitching, YKK zippers, and abrasion-resistant base panels signal long-term durability.