Another thing that might help and which can be carried in a backpack is called
a lap desk. We used to get them for low vision clients to use with their
magnifiers and such. It is a board about the size of a clipboard, maybe a
little larger, on a pillow filled with bean bag stuff so it conforms to your
lap and can be set at an angle and it will hold that setting on your lap. This
gives you a hard relatively firm and solid surface to work on. It might help
students as well which is why I'm sending this to the list. They are
inexpensive and available all over the place like at stationary stores, and in
the blindness catalogs under lapdesk.
