All great ideas!

Here are mine

Extra sweater in case the room is drafty.
footties if you sew bare foot.
desk ott light. surge protecter

Thanks so much for all the information.

be sure to label ALL of your tools, rulers, scissors, rotory cutter ect...when a dozen people all have the same brands (stuff) can happen. i use masking tape...or a sharpie and write right on the tool.
it depends on the class what to carry stuff in...i carry a sewing box if i need lots of different tools and notions...if i don't need that much (stuff) i use a tote bag. call the shop and ask if you need your own cutting mat or if they will provide one for every one to use...also check on iron- machine, ect...
our shops give us a supply list when we sign up for a class telling if we need mats, irons, machines, light boxes, ect...sometimes most of this is available, some times it is not. you don't want to haul a bunch of stuff you do not need.