<blockquote><b>Quoting [yo.]:</b>" Did you go and buy your preschooler a new backpack/lunchbox when they went? R starts tomorrow and I don't know what to send with him. He needs a lunch too."</blockquote>
My child's school was specific on what to bring to help ME as we'll as the teachers.
I'd assume he will need an insulated bag will a cold pack inside unless they provide lunch or it's halfway.
We don't have a backpack for ours but she keeps a tote there that has a change of clothes and her sleeping bag and pillow.
I bought her a backpack the school asked that she bring a change of clothes, a blanket and a pillow so i stored it all in the backpack. With lunch it can vary by the preschool on whether or not they provide or u provide. If u provide, might asbwell by a lunchbox.