reMarkable is offering an official sleeve aka. Folio, but many users aren't very happy with it's quality. This page tries to list alternatives.

When looking for an alternative, it's useful to know that the following more popular devices have roughly the same dimensions as the reMarkable:

• Samsung Galaxy Tab S (10.5“)
• iPad 2
• Asus ZenPad 10”

CAUTION: Do not buy any cases that have a magnet in them. Magnets impact the EMR Pen technology and will temporarily impair the functionality of your device. If you do bring a magnet near the reMarkable, a few reboots will clear the issue.

• reMarkable
• Emmerson Gray reMarkable Sleeve
• Yuanzhu-dpt-cp1-cover
• Samsung Tab S Book Cover
• Azpen-A1023
• Tucano
• maroo
• apple
• draftsman5
• Moleskine 9-10" tablet sleeve, Leuchtturm pen loop
• Rivacase 3127 Universal Reversible 10 Inch Tablet Cover Case
• MoKo 9-10 Inch Sleeve Bag, Protective Felt Case Cover
• Mead Cambridge Limited Refillable Notebook Cover
• KuRoKo Premium PU Leather Case Cover with Hand Strap, Pen Holder for Remarkable Digital Paper (Black)
• Capra Leather reMarkable Tablet Case
• Ayotu Skin Touch Feeling Folding Case for Remarkable Paper Tablet

The following pages provide some inspiration on making your own sleeve.

• Custom reMarkable Sleeve by splitbrain
• reMarkable custom foldable cover by Candleburningonbothends