Some "ultra" high compression packs actually downscale textures from 512x512 to 256x256. This reduces the visual fidelity, but allows the file size to plummet. Use these only for low-end hardware (like an old laptop or a Raspberry Pi).
The little cube lives on, and thanks to modern compression, it can live in your pocket. Gamecube Roms Highly Compressed
To play Gamecube ROMs on your device, you'll need an emulator. Here are some popular emulators for different platforms: The little cube lives on, and thanks to
: An older Dolphin-specific compressed format that is still widely compatible but generally less efficient than RVZ. A legacy format designed to strip all non-essential data
A legacy format designed to strip all non-essential data. While it creates the smallest possible files, it can cause compatibility issues with some games and is generally being replaced by RVZ.
As you can see, you can fit the entire top 10 games on a single 4 GB USB stick.
NKit is a command-line tool (though GUI versions exist) that converts games into a "recoverable" lossy format.