When I was a kid, the tub in the bathroom had two knobs to control the faucet and shower: one marked with a red H, one marked with a blue C. Easy to understand, consistent with the faucets in the kitchen and bathroom sinks, easy to control. There was the little thing to pull up and redirect the flow from the faucet to the showerhead.
Every tub/shower fixture in the apartments I've lived in and all the hotels I've visited since has been different. They have all replaced this simple arrangement with some godawful thing that tries to combine the two variables of "amount of hot water" and "amount of cold water" into one knob/lever/dial/whatever. Usually with absolutely no markings. It takes an annoying amount of time to figure these out the first time and sometimes they remain annoying forever - the one in my current apartment is mounted at a weird angle, so "off" is slightly to the right of pointing the handle straight down; maximum hot water is somewhere below pointing straight right, and pointing straight right is cold. Pointing straight down is an annoying, chilly trickle.
Every time I take a shower I miss the simplicity of two knobs, clearly marked.
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The humble handlebar-mounted bicycle gear shift. So much more pleasant than reaching down to a little lever mounted on the frame like I did before these became standard on even the cheapest bikes. Just move my hand over on the handlebar a little, grab, and twist: there's a little resistance, then a distinct click as it moves to the next spot, which changes the tension in the cable and makes the derailleur do its job of moving the chain from one gear to another. It is not perfect, but its failure modes are much more prone to "a little out of alignment and now you skip over a gear or two in the middle" than "it's super easy to shift the chain off the gears entirely". People have come up with other ways to alter the gear ratio between the crank and the wheel but they are all much more complex and power-hungry than the grip-shifter and derailleur combination.
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If you want a specific brand and model of thing, my Tom Binh "Pilot" bag is really nice. Durable, reasonably cute, carries my computer and everything I need for a day going out to cafes to work, with enough room for a change of clothes or two if I stuff it tightly. Has some nice touches like a pocket in the center with a drain hole for a water bottle or a compact umbrella, and a pocket in the back that unzips on the bottom so you can empty it and slide it over the extended handle of your big rolling bag when traveling. I've had it for like half a decade and it's been my main bag for a lot of that time. https://www.tombihn.com/collections/travel-bags/products/pil...