Theoretically, the RP2 should be able to accept any microSD card up to 2 TB in size. However, for cost and performance reasons, it is recommended to use a 512 GB or smaller card. Our communities recommend the Samsung Evo Plus or Samsung Evo Select microSD cards for the RP2. For a detailed breakdown on why these specific cards are recommended, see this post on our Subreddit.
If you purchase a Samsung Card, you may be able to increase the speed of the card by reformatting your card and increasing the cluster size (allocation unit size). For exFAT, you should see improvements from cluster sizes as large as 1024KB (1MB). Windows will normally force any removable storage larger than 32GB (64GB+) to be formatted as exFAT.
This is a developing list of tested cases/pouches:
Astage AL-M003 Aluminum Mini Case - Not a smug fit, will need some padding.
Canboc Carrying Case - Fits perfectly.
GLCON EVA Case - Multiple Color options available.
Procase for Samsung DEX Pad - Fits perfectly.
(Please note: most 2DS XL or 3DS XL cases/pouches will work well, but they do vary by brand/size, so you may not get a snug or exact fit. If you have a case that works well for you, please let us know on our Discord Server).
Thumb Grip Caps
This is a developing list of tested thumb grip caps:
(Please note: Most Nintendo Switch/Switch Lite thumb grip caps should fit the analog and digital stick of the RP2. If you have a set of caps that work well for you, please let us know on our Discord Server).