I got a pocket-sized Bluetooth keyboard (also used for travel around Asia), 195mm x 85mm x 15mm, with a flap - NOT a foldable keyboard, though it does have a cover flap and a kickstand. Sold under a few brands, but the dimensions are quite specific. Mine was sold under a "Doohoeek" brand; "CACOE" is another. It doesn't have a touchpad, though.

Its size reminds me of my Psion Series 5 days many years ago. While it doesn't clamshell-mount my phone, my phone sits on the KB nicely, though it's still two things to carry around, not one (I miss the Psion still). I have bought loads of Bluetooth keyboards. Foldable keyboards have more parts to break and have to be unfolded to use them.

Previously I got the TECHGEAR Active Strike Pro MINI Slim (230mm x 149mm x 6mm), not pocket-sized, but it has a touchpad. The Geyes Foldable "tri-foldable" (223mm x 54mm x 18mm closed, 223mm x 170mm x 6mm open) got a broken hinge.

For comparison:

- Pocket keyboard ("Doohoeek", "CACOE", etc): 195 x 85 x 15 mm. Pocket-sized, flap/kickstand; no touchpad.

- TECHGEAR Active Strike Pro MINI Slim: 230 x 149 x 6 mm. Not pocket-sized; has touchpad.

- Geyes tri-foldable: 223 x 54 x 18 mm closed; 223 x 170 x 6 mm open. Foldable; hinge risk.