Previous versions up until Mojave 10.14 did fit in a bootable 8GB USB flash drive but when you download macOS Catalina 10.15 from the App Store it says is an 8.09GB download so I guess it won´t fit in an 8GB USB flash drive. Has someone already tried to make a Catalina bootable USB flash drive using an 8GB drive?. Thanks !
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I didn't even try (always used 8GB sticks in the past), because the full download is over 8GB. Looks like I'll be using 16GB sticks from now on.