- Good alphabet flashcards. Preferably, ones that are cute, durable, use short words, and that address the multiple sounds of letters in English (short and long vowels, hard and soft consonants, etc). Ones with separate diphthongs and digraph cards would be ideal, but I'm not sure such a set exists? Until then, this PDF set of printable alphabet flashcards is pretty good.
- Good vocabulary flashcards. What constitutes good in this case? Not culturally-specific, unambiguous pictures, addressing variances within English (American versus British English, so listing both "truck" and "lorry"), and containing important, basic words: people, places, animals, important verbs, classroom words, colors, and so forth. If you're teaching business English, or academic English, you obviously have more specific needs.
- A die (or two dice).
- A soft ball, or stuffed animal, or something else you can safely throw indoors. Get a large plush dice and combine this one with the above point, plus you get the bonus of a dice that rolls quietly. My wooden one is kind of loud, which can drive me up the wall.
- A watch with a secondhand, or a stopwatch.
- Extra pencils.
- A small notebook.
- Small little somethings that little hands can easily manipulate (I use a set of wooden Jenga blocks in one of my classrooms).
What else has made your teaching life easier?
This also is brilliant, though perhaps too bulky to tote around with you while globe trotting. Certainly, you could MacGyver one up yourself (or alter it for preferred vowel pronunciations), or convince your school to order one: The Color Vowel Chart.