The 8BitDo Micro Controller is a Bluetooth gamepad with a 16 different inputs that you could fit into your back pocket. It costs $24.99.
Weighs 24.8 grams featuring 16 buttons. Ultra-portable and versatile. Supports firmware update Mode switching button Supports button mapping in 8BitDo
8Bitdo Micro Bluetooth Gamepad Pocket-sized Mini Controller for Switch, Android, and Raspberry Pi, Supports Keyboard Mode (Green)
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8BitDo stuffed 16 buttons into its hand-crampingly small Micro controller
Joystick 8BitDo SN30PRO+ V2
8BitDo's Switch Micro Controller Weighs Less Than an AA Battery
Ultimate control, style, and performance all for a great price. Customize button mapping, stick & trigger sensitivity, vibration control, and more with 8BitDo Ultimate Software on Xbox Series X/S, Xbox One, Windows, iOS, and Android. The 8BitDo Ultimate Wired Controller for Xbox was designed in a playful pastel pink to add a bit of color to your gaming setup. 8BitDo Ultimate Software gives you elite control over every piece of your controller.
8Bitdo Ultimate Wired Controller for Xbox Series X, Series S, Xbox One - Black
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8bitdo USB Wireless Adapter Receiver for Switch Pro /PS5/PS4/Xbox Controller
Weighs 24.8 grams featuring 16 buttons. Ultra-portable and versatile., Compatible with Switch and Android, Supports firmware update, Mode switching
8BitDo Micro
8BitDo Micro Bluetooth Controller Pocket-sized Mini gamepad for Switch, Android, and Raspberry Pi, Support Keyboard Mode - AliExpress