Are there any common household items or products that you think are designed incredibly poorly?
For example, I'm incredibly confused about how you're supposedly to measure liquid laundry detergent with the cap. At least the kind that I have sits on it's side, so if you measure it with the cap it just leaks everywhere and makes a mess.
Or at my parents house they have a bag of captain crunch berries that has a new design, where instead of zipping along the top of the bag like normal, it has a zipper in the front slightly beneath the top. That way when you poor it you can't see what you're doing cuz the bag is in the way. Like what the heck who's idea was that?
Reusable water bottles, especially their lids. They build up microorganisms faster than a petri dish and the more complex the bottles are, the worse it is.
Worst offender are the ones with integrated straws. Sure, they look nice and are a good idea, but cleaning them thoroughly is a nightmare. Also, I don't know how people tolerate the ones with exposed straws or mouthpieces. Isn't that incredibly unsanitary?
More generally, why doesn't anyone except for Nalgene make reusable bottles without rubber gaskets? Gaskets get stinky, then you have to peel them out, scrub like mad, and then awkwardly stretch them back in. I've been looking for a metal water bottle without a gasket for ages. They literally just need to shove the Nalgene-type screw-on top into a metal body.
Bonus points if someone designs a gasket-less bottle that opens in the middle so I don't have to fiddle with a bottle brush every time I wash it.
The issue you're highlighting is due to the different between metal and plastic. I have an Orca bottle that has a plastic lid that screws on without any rubber gasket and I end up with shreds of plastic in the bottle.
Plastic rubbing on metal leads to the plastic degrading and metal on metal does not make a good seal, so I think a rubber gasket is your only option.
Perhaps a design where both mating surfaces are plastic with metal for the rest of the body? A lot of vacuum insulated bottles have plastic bonded to metal in the cap, they just have to repeat that with the bottle itself
About ten years ago I found and ordered a glass bottle with a fitted silicone lid. It's not tight enough that the bottle can be tipped upside down without the water slowly dripping out, but it's great for keeping stuff out.
I always wanted to see a company make a glass bottle with silicone top that was completely leak-proof.