If anyone's looking for cheap and easy teacher presents, I've just done an order of these sue shopper bags from Mia Tui.
They're basically reusable shopping bags but they have a middle zipped section which divides the bag into two halves with a safe pocket in the middle (but there's enough flexibility that if you something big you want to put in it that you don't want to split in two, you don't need to). And they have a little pocket that they fold into to keep them neat and tidy and small enough to go into a pocket or handbag.
Must admit I have several of these bags I use a lot - shopping, swimming, hoildays, just as a bag when I want a really light handbag for the day, because they have a zip pocket in you can keep stuff safe unlike most reusable/fold away bags.
And a s a teacher present they're great as they are cheap, won't break, should be useful, won't matter if the teacher has more than one, not too personal or impersonal.
£5 each but if you use the code ST20 you get 20% off so they're £4 each. Free postage if you spend more than £25 (I've bought one of their little make up bags with lots of pockets inside for £8 instead of £10 as the discount works on other stocking fillers too) to try as it looks useful as a present for dh to give to me 
Thought I'd give them to the teachers with either a chocolate santa, bag of chocolate coins or similar (don't trust ds2 to have glass bottles in his bag!).
Best of all - I have ordered them now and so they should be hear soon and I can be organised about teacher presents instead of my usual mad dash to the supermarket and buying something that isn't' on offer but is at least on the shelves...
(and no, not affiliated with the company in any way other than a happy customer!)