Zero waste through security means solving one problem: fitting reusable, refillable and plastic-free products into the same 100ml liquid limits and clear bag rules as everyone else. Get the order right and you'll board with a toiletry bag that produces almost no waste and clears the tray in one pass.
- Solid soap and shampoo bars skip the 100ml liquid rule entirely for a zero waste toiletry bag for flights in 2026.
- A jungle culture reusable safety razor with spare blades replaces disposable razors without a single-use handle in the bin.
- UK airports still cap liquids at 100ml per container inside one clear resealable bag roughly 20cm x 20cm.
- Bamboo toothbrush and bamboo face cloths cut two more plastic items from carry-on without adding weight.
Why this matters
Most "eco" travel kits fail at the security tray because nobody checked the liquid rule before packing. A 150ml conditioner bottle gets binned on the spot, and the traveller ends up buying a plastic mini version airside — the exact waste they were trying to avoid.
Solid and bar-format toiletries sidestep the 100ml problem because they're not liquids at all. That's the whole trick behind a genuinely zero waste toiletry bag for flights: swap liquids for solids wherever you can, and only carry true liquids that fit the rule.
What you'll need
- One clear, resealable bag no larger than roughly 20cm x 20cm (the standard UK airport size)
- Solid soap or a soap bar in a breathable pouch instead of shower gel
- A bamboo toothbrush rather than a plastic-handled one
- A reusable safety razor with spare blades packed flat
- Two or three bamboo face cloths for cleansing and drying
- Any true liquid (contact lens solution, prescription items) decanted into containers of 100ml or less
- A small drawstring pouch to separate wet items like a used soap bar from dry ones
The steps
1. Sort liquids from solids before you touch a bag
Lay everything on the bed and split it into two piles: things that pour, and things that don't. In 2026 the UK liquid rule still applies at almost every domestic and international departure gate — 100ml per container, all containers fitting into one clear bag. Anything solid, including shampoo bars and solid deodorant, skips this rule entirely because it isn't classed as a liquid, aerosol or gel.
Common mistake: packing a half-used 200ml liquid bottle assuming security will "let it through because it's half empty." Container size is what gets measured, not how much is left inside it.
2. Decant only the liquids you can't replace
Contact lens solution, liquid medication and specific prescription creams usually can't be swapped for a solid format, so these go into 100ml-or-under travel bottles. Fill each one no more than 90% full to stop leaks at altitude when cabin pressure drops.
Label each bottle with a strip of tape and a marker rather than trusting memory three days into a trip. This one habit prevents most spills reported by frequent flyers packing reused containers.
3. Swap your razor for a reusable one with spare blades
A disposable razor gets binned after a handful of uses and can't go in checked or cabin luggage loose without a cap, so it's a double loss for space and waste. A reusable safety razor keeps the same head for years and only the blade gets replaced.
Wrap the blade edge in a spare face cloth or a dedicated blade case before it goes in the bag — loose blades are the top reason toiletry bags get pulled for a manual check. Buy a metal-cased travel razor if you fly more than four times a year; the housing protects the blade and stops rust from damp bags.
4. Pack a solid soap bar instead of shower gel
A standard 250ml shower gel bottle won't clear security at all unless it's decanted, and decanting shower gel is messy and rarely worth it for a two- or three-day trip. A solid soap bar sidesteps the whole issue and typically lasts longer per gram than bottled gel because you're not diluting it with water before use.
Carry it in a breathable pouch, not a sealed plastic bag — trapped moisture is what turns a soap bar to mush by day two of a trip.
5. Switch to a bamboo toothbrush and a solid toothpaste tablet or bar
A plastic toothbrush handle is one of the most common single-use items still packed for flights in 2026, and it adds nothing that a bamboo toothbrush doesn't do just as well. Pair it with a solid toothpaste tablet if you use one, since tablets aren't liquids and never touch the 100ml limit.
Dry the toothbrush head before it goes back in the bag. A damp bristle head sealed in a case for six hours on a flight is the fastest way to grow bacteria in a travel kit.
6. Use bamboo face cloths instead of single-use wipes
Makeup remover wipes and face wipes are single-use by design, and a pack of ten adds up to real plastic waste over a week away. Two or three bamboo face cloths do the same cleansing job and wash out in a hotel sink overnight.
Pack one dry and roll the others separately so a damp cloth doesn't dampen everything else in the bag. Skip wipes entirely on short trips — a single cloth plus a bar of soap covers cleansing and makeup removal for most people.
7. Do a final size and weight check against your bag
Weigh the packed toiletry bag before you leave the house. A zero waste kit built from solids and reusables is almost always lighter than the liquid-heavy version it replaces, since bar soap and solid shampoo weigh less than the water in their liquid equivalents.
Check the clear bag still zips flat and fits inside your carry-on's outer pocket for the security tray. If it bulges, you've packed a liquid you didn't need — go back to step one.
Troubleshooting
Soap bar arrives soggy and half-dissolved. The pouch wasn't breathable enough, or the bar went in still wet from the last use. Let it air-dry for at least an hour before sealing it in a travel tin.
Security flags a solid deodorant as a paste. Some balm-format deodorants sit in a grey area and get tested with a swab. Carry it in original packaging with the label visible to speed up the check.
Razor blade rusts between trips. Damp bags trap moisture against metal. Dry the blade fully and store it with a drop of oil on the edge if it's not used for more than a month.
Bamboo toothbrush bristles fray fast on trips. Heat and friction from a sealed case speed up wear. Rinse and air-dry the head before packing rather than sealing it damp straight after brushing.
Clear liquid bag won't close over decanted bottles. You're carrying too many true liquids. Recheck which items actually need liquid format versus a solid or tablet swap.
Face cloth smells musty after two days of reuse. Damp cotton and bamboo blends need airflow. Clip it to the outside of your bag between uses rather than folding it away wet.
Tools and resources
- Clear resealable liquids bag, roughly 20cm x 20cm, reused trip after trip
- Small drawstring or waxed pouch for a wet soap bar
- Reusable safety razor with a metal travel case
- Bamboo toothbrush with a vented travel cap
- Bamboo face cloths, at least two per trip
- A luggage scale to confirm the bag's weight before you leave
What to do next
Once the toiletry bag is sorted, the rest of the wash bag usually follows the same pattern: solids over liquids, reusable over disposable. Check what a full plastic-free bathroom looks like at home before your next trip, so the swap doesn't stop at the airport.
FAQ
What's the best zero waste toiletry bag for flights in 2026?
A zero waste toiletry bag for flights pairs a solid soap bar, a bamboo toothbrush and a reusable safety razor with only the true liquids you can't replace, decanted into 100ml containers. This keeps the bag under the standard clear-bag liquid rule while cutting most single-use plastic.
Can solid shampoo bars go through airport security without restrictions?
Yes, solid shampoo and soap bars aren't classed as liquids, gels or aerosols, so they don't count toward the 100ml limit. Keep them in a breathable pouch rather than a sealed liquids bag.
Is a reusable safety razor allowed in hand luggage?
A reusable safety razor with the blade removed or cased is generally allowed in hand luggage, but rules vary by airline and airport. Pack the blade in a protective case and check current guidance for your specific departure airport before flying.
How much liquid can I take in a carry-on toiletry bag?
UK airports currently limit liquids to 100ml per container, with all containers fitting into a single clear resealable bag around 20cm x 20cm. This limit applies to gels, pastes and aerosols as well as liquids.
Do bamboo toothbrushes need special packing for flights?
No, a bamboo toothbrush packs the same as a plastic one and isn't subject to the liquid rule. Dry the bristle head fully before sealing it in a travel case to stop bacteria building up during the flight.
What should I avoid packing in a plastic-free toiletry bag?
Avoid decanting liquids you don't strictly need, since every extra 100ml bottle takes up space that a solid alternative could fill for free. Loose razor blades and sealed-wet face cloths are the two most common items that cause a bag to get pulled for a manual check.
Are solid deodorants better than liquid or spray deodorants for travel?
Solid and balm deodorants avoid the aerosol and liquid restrictions entirely, making them the more reliable choice for carry-on travel in 2026. Keep them in original packaging so the label is visible if security asks for a check.
One last thing
The single biggest waste saving in a travel toiletry bag isn't the razor or the toothbrush — it's the soap. A liquid shower gel bottle is roughly 80% water by weight, so a solid bar doing the same job for a week of travel avoids shipping and carrying water you'll rinse straight down the drain anyway.
