Sorry. I don't say piss bottle normally oc.

I've got a bottle mounted along the near-level top tube of a bike and predictably the water sloshes about a lot. I tried cutting an old plastic pop bottle into a sort of tabbed tube and put it inside the bike bottle but it didn't really change things much. I think a screw thread shape would be better but not so easily done. I've seen a sort of plastic wool mesh used for this, any other ideas or tips that don't include adding lots of dodgy particles to my water?

+100 for the alt swear filter. Bid0n = piss bottle
That should get some thread attention

I can't help, but equally couldn't help wondering what was out there already and found this, which perhaps seems over-engineered but offers an alternative solution: https://smartshake.com/en-gb/products/runbottle-black

I know fuel tanks use foam to stop fuel sloshing about but you would then, presumably need a straw or some serious sucking to extract all the water.

Bulk liquid carriers just use a series of baffle plates. Not sure how you'd squeeze them into a bottle though... I guess if you could cut suitable shapes out of flat plastic with four tabs on them (and a hole at the bottom), bend the tabs then shove them in?

It's getting the item into the bottle that seems the main problem. Thought about some kind of corkscrew thing cut from plastic sheet like this -

jameso wrote: ↑Sat May 31, 2025 10:11 am Bidon

Note to self. Don't get this thread mixed up with the bidet one.

Mountain-bikers!

Tired of your water sloshing around inside your piss bottle on a bumpy ride?

Just replace the water with ice-cream and strawberries, then enjoy a tasty milkshake instead!

Well worthy of Viz that one...

Top top tip Pete