The iClever Bluetooth Foldable Portable Mini Keyboard can literally fit in your pocket when it is folded making it one of the most portable keyboards out there. I like that it has a rechargeable battery and doesn’t use AAA’s. The battery can last for up to 90 hours of straight typing. The reviews are very positive about the build quality and feeling in the keys. The only thing I don’t like is the number keys are offset to the right a bit.
Such a small size keyboard meets most of your typing requirements. Aircraft-grade aluminum material and sand finish after oxidation process combines quality promotion with vision of beauty. It is sturdy and durable enough to withstand different extent of wear.