Typing on glass is fine until you have to write something real. The Logitech Keys-To-Go 2 answers that moment: a full, quiet Bluetooth keyset that pairs with tablets, phones, and laptops across every major OS.
The trick is the built-in cover. It folds over the keys when you are done, so it survives the inside of a backpack without a separate case. Logitech rates the coin-cell battery at up to 36 months, which means you will forget it even has a battery.

At $79.99 it sits in impulse territory for anyone who works from coffee shops, airports, or couches. Lilac is the fun pick; Graphite keeps it professional.
We have covered portable keyboards before, including the NuPhy Kick75, but few disappear into a bag this cleanly.