I guess I would describe myself as someone who tries to be practical and won't spend if I feel like I honestly don't need it. This does not mean I don't have any regrets for stuff I wish I bought. Let me write about some of them.
There was this drybag backpack being sold in Muji last Christmas season for a very reasonable price. I can't remember if it was less than PhP400 or PhP700 but the dry bag was big and I honestly wanted it. Except I also felt like I didn't need it since I have two or three day bag backpacks, and one slightly bigger bag I use for longer stays. Also seeing as how I rarely leave the house I didn't see the need for another bag I would only use maybe once or twice a year, so I passed on it.
Unfortunately after the Christmas season I guess they decided to stop selling it because whenever I visit Muji now there is no trace of that drybag backpack. Oh well.
Then there was this tempered glass add on for my Nord CE 3 Lite 5G. I had a shop install it, which meant that the protective film factory stuck on the screen had to be removed. Unfortunately the tempered glass installed I guess didn't have adhesive or whatever, so every time I placed my phone in my pocket when I pulled it out the glass shifted. Eventually air bubbles came in so I had to adjust or remove and place the glass again until I just got fed up and got rid of it. It was most likely also not made for my phone since it was too narrow, I guess that's the problem with getting a "niche" phone.
One surprising regret was the Bench x SB19 convertible cargo pants. I was looking for a relatively decent looking pair and this actually didn't look like it was designed for mountain climbing. Sadly I could not find any in the Bench stores and whatever stock was left in their online stores were also sold out.
Those are three things that top of my head are shopping regrets. Though to be honest if ever the drybag backpack shows up in Muji again I just might buy it and sell/give away one of my existing backpacks.
Out.