In the past, space requirements for USB media was about 2GB.
Today, 2 GB seems no longer sufficient.
With the latest version, what are the minimum space requirement for the USB media?
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For just the PortableApps.com Platform, all you need is about 10MB.
For the apps as well, that depends on how many and which ones.
I wouldn't really say there is a minimum or typical capacity.
It all depends on your requirements and expectations.
Up to a point you gain more value with larger capacities, so I would just invest in largest you can afford if the capacity is the primary deciding factor.
If at first you do not succeed, use more sticky tape.