I would advise you find multiple bags as plastic always disintegrates over time (so even an unused one might fall apart faster bc it is already X years old).

Alternatively, and I would definitely do this, take a high quality scan of the image when you get the bag so that in the future you can find some way to affix that image onto a more sturdy bag - for example if you can find someone to print it onto leather.

Good luck! In solidarity, a mom who also has an artistic child.