You will be surprised how big the difference between the two is...

Onyx Boox Palma characteristics and official stores:
https://onyxboox.com/boox_palma
https://euroshop.boox.com/

Sleeves:
1) Kwmobile Mobile Phone Case for Smartphones L - 6.5 Inches - Neoprene Mobile Phone Case Cream - Mobile Phone Case 16.5 x 8.9 cm Inner Dimensions
https://www.amazon.de/dp/B0CHB3DYWZ?r...

2) Universal Tactical Molle Holster Army Mobile Phone Belt Pouch EDC Security Pack Carry Accessory Kit Waist Bag Case Compatible iPhone 13 14 PRO X XS Max XR 7 8 6s Plus Samsung Galaxy S10 S9 S8 Plus
https://www.amazon.de/dp/B01I5GSNI6?p...