It sounds reasonable to me that your son replace the science sack .. not sure what might be in such a sack but I imagine it must have been somewhat expensive. I have no idea where you might get science supplies. I bet the teacher gets them in bulk from a supplier ??

I like the list idea - I'm going to create a list with my son and then make a few copies and try it out. If it helps, then I'll get the list laminated so that he can use a dry erase marker and check mark off the items each day.