Check out tomtoc's G12 armor case or their T26 sling bag here:

G12 Armor case:
https://amzn.to/3TxJHv6

T26 Sling bag:
https://amzn.to/3Ty5zXk

What I use with my Steam deck (affiliate):

🧠 Steam Deck SD Card:
https://amzn.to/3Yej3Zx

🔋 Battery bank:
https://amzn.to/3OKIbEz

📺 My 4k monitor (works great with steam deck, has usb-c and power, one cable does everything):
https://amzn.to/3Xl67R9

👾 Usb-c dongle to hook up to TV/monitor/external drive/etc:
https://amzn.to/3jJWoFa

🔍Steam Deck Screen protector:
https://amzn.to/3XfHm7Y

🔌 Long charging cable (usb-c to usb-c):
https://amzn.to/3lJyvye

⚡️ 45w charging brick:
https://amzn.to/412D470

🎮 Controllers I use with steam deck:
https://amzn.to/3RJ2H8y

📀 Internal storage m.2 nvme 2230:
https://amzn.to/3lJ7Txl

🎹 Wireless keyboard (also works great with mac, can connect to mac and steam deck at the same time and switches with one button push)
https://amzn.to/3IAAb4U

🪑sit/stand desk:
https://amzn.to/3LqL76s