Any small annoyance in your daily life that causes mild stress. If you can afford it, buy the tool that solves the problem.

I was constantly looking for my phone charger, taking it into my car, leaving it downstairs and realising I needed it in bed. I just bought 4 more cheap ish chargers and now have one everywhere. Seems like an obvious solution but I was putting up with it for years not realising the mental toll it took on me daily. Same thing can be applied all across your life, if something makes it 1% easier, it’s worth it!

Other items that worked for me:

• A good tin opener, no longer am I fumbling or cutting myself with the old rusty shit one I had.
• Charger cables
• Threw out all my odd and unwanted socks/underwear. Bought new sets. No longer spending 5 minutes every morning pairing them up and avoiding the ones that didn’t quite fit right or were uncomfortable
• Double up on household items that are bought infrequently. i.e toothpaste, deodorant,other toiletries, cleaning supplies, long lasting food items. There’s nothing more annoying than knowing “I need to buy another one soon before it runs out”, then having the thing run out on you before you’ve had the chance to replace it. The added buffer item goes a long way for avoiding the potential inconvenience.

Nothing here sounds like it would be a “productivity” item, but the method saves me a good few minutes every day and it does add up. I also avoids the mental toll/annoyances which keep me in a better mood and therefore more productive.