A backpack that's been used daily for 6 months smells like it. Sweat salt builds on the shoulder straps. Crumbs and dirt settle into seams. The bottom picks up grime from floors, buses, and airport carousels. Eventually, the bag needs a wash.
But throwing a backpack into a washing machine the way you'd toss in a t-shirt is how water-resistant coatings get stripped, padding gets lumpy, and zippers stop working. The fabric survives, but everything that makes the bag functional can be damaged.
Our guide covers the right way to clean every type of backpack material without shortening the bag's life.
Can You Put a Backpack in a Washing Machine?
Sometimes, but with restrictions.
Materials that can handle a gentle machine cycle
Nylon and polyester backpacks (most everyday backpacks and travel backpacks are made from these) can survive a machine wash on a gentle or delicate cycle in cold water. Canvas bags also tolerate machine washing.
Materials that should never go in a machine
Backpacks with PU-coated or water-repellent fabric. The agitation and detergent strip the coating, turning a water-resistant bag into a water-absorbent one. Bags with internal frames or stays (the metal or plastic structure can bend or puncture the drum). Leather-trimmed bags. Bags with built-in electronics like USB charging ports.
The rule
Check the care label inside the bag. If it says "spot clean only" or "do not machine wash," follow it. If there's no label, default to hand washing. It's always safer.
How to Hand Wash a Backpack (the Safest Method)
Hand washing works for every backpack material and is the method that preserves coatings, padding, and structural integrity the longest.
Step 1: Empty everything
Open every pocket, every compartment, every hidden zip. Shake the bag upside down over a bin to get out crumbs, sand, and debris. Use a vacuum nozzle along seams and crevices if the bag is heavily soiled.
Step 2: Remove detachable parts
Take off detachable straps, hip belts, rain covers, and any removable frame or back panel. Wash these separately by hand with a sponge and mild soap.
Step 3: Spot-treat stains
Mix a teaspoon of mild detergent with lukewarm water. Apply to stains with a soft-bristled brush or sponge. Work in circular motions. Let the solution sit for 15 to 20 minutes before the full wash.
Step 4: Submerge and wash
Fill a bathtub or large basin with lukewarm water (not hot, as hot water can shrink fabric and damage coatings). Add a tablespoon of mild, fragrance-free detergent. Submerge the backpack and swish it gently. Use a sponge to scrub the interior and exterior. Pay extra attention to shoulder straps, the back panel, and the bottom of the bag where sweat and grime accumulate most.
Step 5: Rinse thoroughly
Drain the soapy water. Refill with clean, cool water and rinse until no detergent remains. Leftover soap attracts dirt faster and can degrade fabric coatings over time.
Step 6: Dry properly
Gently squeeze out excess water without wringing or twisting. Hang the bag upside down with all zippers open so water drains out of every compartment. Dry in a shaded, well-ventilated area. Never put a backpack in a dryer (heat warps buckles, melts coatings, and damages padding). Never dry in direct sunlight (UV breaks down nylon and fades colours).
How to Machine Wash a Backpack (When You Must)
If the care label allows machine washing and the bag has no frame, no PU coating, and no leather:
Preparation
Empty all pockets. Remove detachable straps and hip belts. Spot-treat stains first. Turn the bag inside out. Place it inside a pillowcase or mesh laundry bag to protect straps and zippers from getting caught in the drum.
Wash settings
Cold water only (below 30 degrees Celsius). Gentle or delicate cycle. Half the usual amount of mild liquid detergent. No fabric softener. No bleach. No powder detergent (it can leave residue in fabric fibres).
Balancing the load
A backpack alone in a machine can clump to one side during the spin cycle, causing the machine to thump and the bag to get unevenly stressed. Add two or three old towels to balance the load and cushion the bag.
Drying
Same as hand washing: never use a dryer. Hang upside down, all zippers open, in shade with good airflow.
How Often Should You Wash a Backpack?
After every trip
Do a quick wipe-down. Empty all pockets. Shake out debris. Wipe the exterior with a damp cloth. This takes 2 minutes and prevents dirt from building up between washes.
Monthly (if used daily)
If the bag goes to work or college every day, a monthly spot clean of the shoulder straps, back panel, and bottom keeps sweat salt from degrading the fabric. No need to fully submerge the bag each time.
Every 3 to 6 months (deep clean)
A full hand wash or machine wash (if safe for the material) every season keeps the bag in good condition long-term. More frequently if the bag has been exposed to rain, mud, food spills, or heavy sweat.
After specific events
Got caught in monsoon rain? Spilled food inside? Came back from a dusty trekking trip? Wash immediately rather than letting stains set. Fresh stains are dramatically easier to remove than dried ones.
How to Clean Specific Parts of a Backpack
Shoulder straps and hip belt
These absorb the most sweat. Scrub them separately with a sponge, mild soap, and lukewarm water. Rinse thoroughly and squeeze dry. If they're removable, detach them and wash independently.
Zippers
Dirt and sand in zippers cause them to stick and eventually break. Use a soft brush (an old toothbrush works perfectly) to clean along the zipper teeth. Avoid hard scrubbing on zippers with water-resistant coatings. If a zipper sticks after cleaning, apply a zipper-specific lubricant.
Back panel and padding
The back panel sits against the body and absorbs sweat on every use. Scrub it with a damp sponge and soap, paying attention to the edges where salt deposits build up. Rinse and squeeze gently. Do not wring the padding as it can lose its shape.
Rain cover
If the bag comes with a bundled rain cover, wash it separately by hand in lukewarm water with mild soap. Rinse and air dry completely before storing it back in the bag. A damp rain cover stored inside a backpack creates mould.
What Products to Avoid When Washing a Backpack
Bleach: Weakens fabric fibres, strips colour, and destroys water-resistant coatings.
Fabric softener: Leaves a film that reduces the fabric's ability to breathe and repel water.
Hot water: Shrinks fabric, fades colour, and damages PU coatings.
Harsh stain removers: Test on a hidden area first. Many stain removers contain chemicals that can discolour or weaken technical fabrics.
Direct sunlight for drying: UV radiation degrades nylon and polyester over time, weakening the material and fading the colour.
A dryer: Heat warps plastic buckles, melts adhesives, damages padding, and can permanently ruin water-resistant coatings.
How to Waterproof a Backpack After Washing
Washing can gradually strip the durable water repellent (DWR) coating that makes a backpack resist light rain. After a few washes, you may notice water soaking into the fabric instead of beading up on the surface.
To restore this, apply a spray-on waterproofing treatment after the bag is completely dry. Products like Nikwax or Grangers Tent and Gear work on nylon and polyester. Spray evenly, let it dry, and the water-repellent finish is restored. Reapply every 2 to 3 washes or whenever water stops beading on the surface.
For heavy rain protection, a bundled or separate rain cover is more reliable than any coating. Fabric coatings handle drizzle; rain covers handle downpours.
Frequently Asked Questions
Can you wash a backpack with clothes?
Not recommended. The backpack's buckles, straps, and zippers can damage other garments, and mixed loads can cause color transfer. Wash the backpack alone or with old towels for cushioning.
Does washing a backpack ruin the waterproofing?
Repeated machine washing gradually strips DWR coatings. Hand washing with mild soap is gentler. Either way, reapply a waterproofing spray every few washes to maintain protection.
How do you get the smell out of a backpack without washing it?
Sprinkle baking soda inside all compartments. Leave overnight with zippers open. Shake or vacuum out the baking soda the next morning. This absorbs odours without wetting the fabric.
Can you iron a backpack to remove wrinkles?
No. The heat from an iron can melt nylon and polyester. If the fabric is wrinkled after washing, hang the bag and let gravity smooth it out as it dries. For stubborn wrinkles, use a steamer on the lowest setting held at a distance.
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