Laptop Sleeves - (for end-users). What're you issuing?
(Let's skip the "Are you insane? You know they'll stuff it in the Tesco Reusable Carrier Bag of Exercise Book Crushing Doom if you give them sleeves" issue for the moment, though I agree it's a valid one for certain users who'll get bags instead.)
A simple memory foam sleeve works for me because I take care of mine - I have to fix the things, after all.
For my end-users, I want something like a Booq Vyper but without the price tag.
What have you issued in your school that's worked well?