This is a super-niche and specific model.
do you own a 98-03 Ford Ranger with the 60/40 seats? If so you know the cup holders are not great and are so far they are on a different time zone. I figured that’s something I could solve, so I set off to design a cupholder that would fit specifically in the notch in those 60/40 seats.
And then I thought I could make it even more specific: it fits a 40oz hydro flask because that’s my water bottle. Will it fit others? I've had great success with Trader Joe's 1.25L sparkling water bottles. It fits a Yeti rambler 10oz because that is my favorite coffee cup. Will it fit the 20oz rambler? I don’t know, I don’t have one. If you want to buy me one so I can try. It fits Starbucks paper cups too. And probably other chains.

At this point, I had some room left. Giddy with specificity I made a holder for my mini-condiments (I eat my work lunches in the truck you see). It fits a mini-Tabasco and a mini-tajin. Can you use it for other things? Go ahead and put your sharpie, flashlight, pen… whatever in there! Go nuts and send me the pictures. Come to think of it, it probably works pretty well for slim Jim storage.

I also made an insert to use other cups and bottles when I'm not using the Hydroflask.

The profanity? Well, it is a Ford f#%+¥n’ Ranger