[InSteady]

>Who uses it every day?

There are 52 weeks in a year. After several years of weekly use you have offset the carbon.

> I'd have a decent chance of misplacing the thing before I offset its carbon.

You can keep things simply and only use it for groceries if you have trouble keeping track of things. Keep it in the same location every time, ideally by the door, always return it to it's spot immediately after unloading groceries when you get home. Don't leave a full bag of groceries at the store. You're pretty much set.

You could also go for a recycled PET reusable bag if you just can't trust yourself to hang on to a cotton bag for a few years. Still better than single-use plastics by many metrics as long as you aren't losing bags multiple times per year. And yeah, don't turn around to get your bag when you're halfway to the store; get single-use plastic on that occasion and spend a few moments gently reaffirming your habit/routine that includes grabbing the bag when you head out for groceries.