Open your cupboard and count the drinking vessels. Most Australian households land somewhere between fifteen and thirty. Now count the ones that got used this week. Probably four.
The other twenty-something aren't there because you chose them. They arrived. A housewarming, a set of six where you liked two, the pint glass from a festival in 2019, the mug with the chip you keep meaning to deal with. They've earned their space through nothing except being in it.
Here's an experiment that sorts this out without you having to make a single decision.
How it works

Move the pieces you think you like to eye level. Front row, easy grab. Everything else goes behind or above.
Then for seven days, mark a circle every time you reach for one. That's the whole method. Don't rearrange mid week, don't correct yourself, don't reach for the nice one because you're being observed. The data's only useful if you're honest, and the only person reading it is you.
One circle per reach. No overthinking.
The winner won't be the prettiest one
This is the part that surprises people. The piece with the most marks is rarely the one you'd photograph. It's the one holding your iced coffee at 7am, your water on the coffee table at 3pm, your spritz on Friday, and then doing all of it again the next day.
Pretty gets bought. Comfortable gets used. Those turn out to be different qualities, and only one of them shows up on a tally sheet.
The other thing you'll notice: a few pieces you were sure you loved get zero circles all week. Not because there's anything wrong with them.
They're heavy, or they're the wrong size for what you actually drink, or you're quietly protecting them. A cup you're protecting isn't a cup you own. It's a cup that owns a shelf.
The maths that makes this a sustainability question

Say you spend $35 on a cup and use it for your morning coffee for two years. That's around 730 uses, which works out to under five cents a go.
Now the $12 one bought in a hurry, used four times, then relegated to the back. Three dollars per use, and it's still in your cupboard taking up room a good one could have.
The most sustainable piece in your kitchen is the one you keep reaching for. Not the one with the best packaging claims. Longevity only counts when it's paired with use, and a well made cup sitting unused at the back of a cupboard for six years has achieved nothing except taking up space more efficiently than a bad one.
This is why the reach test is worth a week of your attention. It tells you what to buy more of and what to stop buying, using evidence from your own hand instead of a guess made in a shop.
What to do on day eight
The high scorers get the good shelf permanently. Front row, eye level, no reaching past anything to get to them.
The zeros need a conversation. Some are genuinely seasonal, like the wine glasses that only come out when people are over, and those are fine at the back.
The rest are dead weight. Op shop, a friend moving into their first place, or a container for something in the shed. Please don't put them in the bin because a blog told you to declutter. That's the least sustainable outcome available.
Then there's the honest gap the test exposes. If your top scorer is a cup you don't particularly like and you're using it because it's the only one the right size, that's a buying decision the experiment made for you.
You now know exactly what shape and weight you reach for. Go find a good version of that.
Questions
Seven days feels short. Should I run it longer?
Seven covers a full week of habits, including the weekend, which behaves nothing like a Tuesday. Two weeks gives you cleaner data if you want it. Most people have their answer by day four.
What if I have a big household?
Run it per person, or accept messier data and track the cupboard as a whole. Household-level results still show you which pieces are dead.
Does this work for anything besides drinkware?
Yes, and it's brutal on chopping boards, serving bowls and kitchen tools. Same method, same week.
I already know what I use. Do I need to do this?
Probably not. Though most people who say that discover at least one piece they were certain about scoring zero.
Reusable. Unbreakable. Made for every LifeSTYLD.