21l Backpack

Backpacks for daily commutes, gym sessions, and travel.

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Gymreapers
Under Armour
CROCS US SHOP
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Simple Modern

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
$23.98
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
$46.99
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
$156.00
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
$56.99
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
$31.98
Gymreapers Halo Athletic Compression Shorts for Women - Seamless Knit Interlock Fabric for Breathability and Flexibility, Gym Training Shorts, High Stretch Shorts
$44.99

Alikpop Kpop Functional College Computer Backpack - Oxford Cloth High Capacity Laptop Bag for Teen Girls, Quick-Zip Access, Outdoor-Ready Use
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Alikpop Kpop Functional College Computer Backpack - Oxford Cloth High Capacity Laptop Bag for Teen Girls, Quick-Zip Access, Outdoor-Ready Use

4.4133 sold
-35%$16.89$25.99
21L Sporty Backpack - All In Motion Pink: Water-Resistant School Ready
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21L Sporty Backpack - All In Motion Pink: Water-Resistant School Ready

2 sold
-43%$19.99$35.00
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
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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

4.81.4K sold
-15%$80.99$95.00
21L 17.5'' Canvas Backpack - Open Story Natural: Softside Cotton for College
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21L 17.5'' Canvas Backpack - Open Story Natural: Softside Cotton for College

2 sold
-43%$19.99$35.00
21L Backpack - Navy Blue

21L Backpack - Navy Blue

$16.99
MOSISO Women's Puffy Quilted Backpack - 15-15.6in Laptop Bag with 16in Expandable Carry On Design, USB Port, Adjustable Strap, Padded Straps, Back Zip Pocket, Front Zip Pocket, Multi-Compartment for College Work, Back Zip Pocket Keeps Valuables Close
Free shipping

MOSISO Women's Puffy Quilted Backpack - 15-15.6in Laptop Bag with 16in Expandable Carry On Design, USB Port, Adjustable Strap, Padded Straps, Back Zip Pocket, Front Zip Pocket, Multi-Compartment for College Work, Back Zip Pocket Keeps Valuables Close

4.949 sold
Limited time deal
-59%$19.99$48.99
21L Sporty Backpack Outdoor Backpack for Hiking, School & Travel Lightweight Casual Daypack
Free shipping

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

$14.90
INUK WUUL 21L Adjustable Lightweight Water-Resistant Laptop Backpack - Laptop Computer Bag, Travel & Work Daypack with 14-Inch Sleeve, Organizer, Luggage Strap for School/Commuters
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INUK WUUL 21L Adjustable Lightweight Water-Resistant Laptop Backpack - Laptop Computer Bag, Travel & Work Daypack with 14-Inch Sleeve, Organizer, Luggage Strap for School/Commuters

$38.69
Under Armour Hustle 6.0 Backpack
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Under Armour

Under Armour Hustle 6.0 Backpack

4.8798 sold
$78.00
Dakine - 365 Pack 21L Backpack - Vintage Camo
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Dakine - 365 Pack 21L Backpack - Vintage Camo

$58.00
All In Motion Recycled Polyester Travel Backpack - Water-Resistant, Adjustable, 21L, 17.5in(H), 1.38lbs, With Bottle Holders, Fits 15in Laptop, Backpacks For School, Carry On For Students

All In Motion Recycled Polyester Travel Backpack - Water-Resistant, Adjustable, 21L, 17.5in(H), 1.38lbs, With Bottle Holders, Fits 15in Laptop, Backpacks For School, Carry On For Students

$19.95
Senda 21L Backpack

Senda 21L Backpack

$135.00
Moment Everything 21L Backpack
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Moment Everything 21L Backpack

$150.00
Crocs Classic Backpack, Ready to Personalize Travel and School Bag
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CROCS US SHOP

Crocs Classic Backpack, Ready to Personalize Travel and School Bag

4.932.8K sold
$105.00
19" Sporty Backpack - All in Motion, Budget-Friendly School & Office Supplies Bag, Versatile Bag Backpack, Carry Option, Daypack Bookbag, Rucksack Design
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19" Sporty Backpack - All in Motion, Budget-Friendly School & Office Supplies Bag, Versatile Bag Backpack, Carry Option, Daypack Bookbag, Rucksack Design

4.7962 sold
$28.59
21L Lifestyle Backpack - All In Motion Maroon: Fits 15'' Laptop Water Repellent
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21L Lifestyle Backpack - All In Motion Maroon: Fits 15'' Laptop Water Repellent

1 sold
-45%$21.99$40.00
21L Sporty Backpack - All In Motion Black
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21L Sporty Backpack - All In Motion Black

2 sold
-43%$19.99$35.00
21L Lifestyle Backpack - All In Motion Navy Blue: Fits 15-Inch Laptop Water Repellent
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21L Lifestyle Backpack - All In Motion Navy Blue: Fits 15-Inch Laptop Water Repellent

-45%$21.99$40.00
【NEW IN】BAGSMART Insulated Side Pocket 22L Backpack Stylish Casual Bag for Daily Travel School & Work Thermal Pocket Keeps Drinks Cold Hot sohochic tiktokshopstockup
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BAGSMART

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

4.91.6K sold
-13%$51.99$59.79
The Iris Revive Backpack (#2020) By Iris & Rainbow
Free shipping

The Iris Revive Backpack (#2020) By Iris & Rainbow

4.9496 sold
Flash sale
$102.70
Simple Modern 18L Fletcher Kids' Backpack for Boys and Girls for School, Travel
Free shipping
Simple Modern

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

4.92.8K sold
$71.49
JanSport Cross Town Plus 17" Fits 15" Laptop Water Resistant Backpack
Free shipping

JanSport Cross Town Plus 17" Fits 15" Laptop Water Resistant Backpack

15 sold
-44%$24.99$44.99
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

4.914.1K sold
$58.49
JanSport Cross Town Plus 17" Fits 15" Laptop Water Resistant Backpack - Fuchsia
Free shipping

JanSport Cross Town Plus 17" Fits 15" Laptop Water Resistant Backpack - Fuchsia

12 sold
-44%$24.99$44.99
Portland Gear Cascade Standard 21L Weatherproof Backpack - Travel Carry-On Bag with Laptop Sleeve
Free shipping

Portland Gear Cascade Standard 21L Weatherproof Backpack - Travel Carry-On Bag with Laptop Sleeve

4.92.4K sold
$119.00
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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.