I don't have any statistics on this, but I feel like I see far fewer plastic bags littering the streets these days. That alone is a win for me personally.
In theory they are supposed to be reusable but in practice I think they are going to wind up being single-use for most people. Maybe we'll start using them as garbage bags as they accumulate around the house.
That's the part I struggle with.
Also, if you order groceries for delivery, they bring your order in reusable bags. Which you then keep.
My point is these re-usable bags have a tendency to accumulate over time. Maybe not at the same rate as plastic bags would otherwise, but once you have dozens of these bags at home it starts to be tempting to just use them as bin liners and toss them, just like we did with plastic bags
Which sort of defeats the whole purpose, right? The ideal is people would buy as many as they need and use them for years.
But that isn't going to happen any time soon imo. If ever.
My biggest problem is feeling awkward when I take a bag from store X into store Y.
(When paper bags aren't available. I've always preferred paper.)
Product packaging probably generates 1-2 orders of magnitude more waste than the bags holding the product.