Short answer: most fabric backpacks can go in a machine if you empty every pocket, remove any frame or hip belt, put the bag in a pillowcase and wash cold on a gentle cycle with little or no spin, then air dry upside down with the pockets open. What ruins bags is heat, high spin and water sitting in a seam for three days. Anything with leather trim, a waterproof coating, a rigid frame or electronics gets hand cleaned instead, and that method works on everything, so when in doubt use it.
Machine or hand
| Item | Machine? | Note |
|---|---|---|
| Nylon or polyester school backpack | Yes | Cold, gentle, pillowcase, no spin |
| Canvas tote or rucksack | Yes | Cold. Expect some shrinkage and softening the first time |
| Hiking pack with a frame | No | Remove what you can, then hand wash in a bath |
| Anything with leather trim | No | Water stiffens and stains hide permanently |
| Waterproof or coated bags | No | Detergent strips the coating and agitation cracks it |
| Fabric handbags, unlined | Carefully | Hand wash. Machines distort the shape |
| Structured handbags | No | Interfacing and glue. Spot-clean only |
| Laptop sleeves and pencil cases | Yes | Mesh bag, cold, air dry open |
| Baseball caps | Hand only | The brim distorts in a machine. See below |
| Scarves, wool or silk | Hand | As in washing wool and silk |
| Gym and kit bags | Yes, monthly | Nobody does this, and it is why clean kit smells by Tuesday |
The backpack method
- Empty every pocket, including the ones you forgot. Pens are the usual disaster.
- Turn it upside down and shake it out, then vacuum the inside with the crevice tool. Crumbs and grit turn into a paste in the wash.
- Remove the frame, hip belt and any metal stays. If they do not come out, do not use the machine.
- Pre-treat the straps and the back panel with a drop of washing-up liquid and a soft brush. That is where the body oil is, and it is a grease problem rather than a dirt one.
- Undo every zip and buckle and fasten the clips, so nothing catches and nothing stays sealed.
- Put it in a pillowcase and tie the top. This stops straps wrapping round the drum.
- Cold, gentle cycle, half the usual detergent, no fabric softener. Softener clogs the weave and holds odour.
- Spin low or not at all. High spin is what cracks coatings and distorts padding.
- Dry upside down with every pocket open, indoors, out of direct sun, for a full 24 to 48 hours. Never a dryer, never a radiator.
The hand method, which works on everything
This is the safe default and the only option for frames, coatings, leather trim and structure.
- Fill a bath or large basin with cool water and a small amount of dissolved detergent.
- Submerge the bag, press it a few times to move water through, and leave it 15 minutes. Do not scrub the body of the bag.
- Work the straps, back panel and base with a soft brush. Those three areas are 90 percent of the dirt.
- Drain, refill with clean water, press through again, and repeat until no suds appear.
- Press the water out between towels. Never wring, never twist.
- Stuff it loosely with dry towels or paper to hold its shape, then air dry upside down with pockets open.
By material
- Canvas takes cold machine washing well, shrinks a little the first time and softens permanently. Waxed canvas never gets washed: wipe it with a damp cloth and re-wax when it stops beading.
- Nylon and polyester are the easiest. The only real risk is heat, which melts and glazes them.
- Leather trim gets wiped with a barely damp cloth and conditioned afterwards. Water on hide dries it hard and leaves a permanent tide mark.
- Suede never meets water. Brush it dry with a suede brush and use a block eraser on marks.
- Waterproof coated fabric gets a damp cloth and nothing else. Detergent strips the coating and a cycle cracks it.
- Straw and raffia bags are brushed and wiped only. Water collapses the weave.
- Mesh panels need a soft brush rather than scrubbing, which stretches and tears them.
Hats, caps and the rest
- Baseball caps: hand wash only. A machine bends the brim permanently. Use cool water and a soft brush on the sweatband, rinse, then dry over a round bowl or a ball to hold the crown shape.
- Old caps with a cardboard brim cannot be wet at all. Spot-clean the sweatband and leave the rest.
- Wool beanies: cold hand wash, dry flat, reshape damp.
- Fabric belts: hand wash; never machine wash anything with a metal buckle attached.
- Reusable shopping bags: wash monthly at 60 °C if cotton. They carry raw meat packaging and almost nobody washes them.
- Lunch bags and cool bags: wipe the inside with diluted white vinegar and air dry open. Never submerge an insulated bag.
Common problems
| Problem | Cause | Fix |
|---|---|---|
| Musty smell a week after washing | It was not fully dry inside a seam or pocket | Dry 48 hours upside down with pockets open, in moving air |
| Waterproofing stopped working | Detergent stripped the coating | Reproof with a spray-on treatment made for the fabric |
| Bag came out misshapen | High spin, or it dried crumpled | Rewet, stuff with towels and dry in shape |
| Straps still smell | Body oil, which plain detergent does not lift | Washing-up liquid and a brush on the straps first, every time |
| White marks on dark fabric | Detergent residue from too high a dose | Rinse again in clean water. Use half the normal dose on bags |
| Leather trim stiff and pale | It got wet | Condition it. The tide mark is usually permanent |
| Zip stiff after washing | Detergent dried in the teeth | Rinse the zip, dry it, then rub a candle or zip lubricant along it |
| Ink from a leaked pen | Solvent-based ink in the lining | Surgical spirit on a cloth underneath, blot from behind, then wash |
Frequently asked questions
Can you put a backpack in the washing machine?
Most fabric backpacks, yes. Empty every pocket, vacuum the inside, remove any frame or hip belt, put it in a pillowcase and wash cold on a gentle cycle with little or no spin. Do not machine wash anything with leather trim, a waterproof coating, a rigid frame or electronics.
How do you dry a backpack?
Upside down with every pocket and zip open, indoors, out of direct sun, for a full 24 to 48 hours in moving air. Never use a dryer or a radiator, which melt synthetic fabric and crack coatings. Most musty bags are simply ones that were not dry inside a seam.
How do you get the smell out of a backpack?
Scrub the straps and back panel with a drop of washing-up liquid and a soft brush before washing, because the smell is body oil and detergent alone does not lift grease well. Then wash cold, skip fabric softener entirely, and dry it completely with the pockets open.
Can you wash a baseball cap in the washing machine?
No. The machine bends the brim and it does not come back. Hand wash in cool water with a soft brush on the sweatband, rinse, then dry over a round bowl or a ball so the crown keeps its shape. Older caps with a cardboard brim should not be wet at all.
How do you clean a bag with leather trim?
By hand, and keep the leather dry. Wipe the trim with a barely damp cloth and condition it afterwards. Clean the fabric around it with as little moisture as you can manage. Water on hide dries it hard and leaves a permanent tide mark.
Does washing a backpack ruin the waterproofing?
It can. Detergent strips the durable water repellent finish, and agitation cracks coated fabric. For anything genuinely waterproof, wipe it with a damp cloth instead of washing it. If a bag has stopped beading, reproof it with a spray made for that fabric.
How often should you wash a gym bag?
Monthly. Almost nobody does, and it is the usual reason clean kit smells again within days of being put back in. The same applies to reusable shopping bags, which should go through a 60 °C wash if they are cotton.
