The fine folks have Pocket built this tool specifically for Springpad users, so it's very easy: just head to Springpad's export tool, export your data, and then import it into Pocket here. It will even preserve all your tags.
You can also import your Springpad items into Evernote using Springpad's export tool as described here.
Springpad is shutting down on 25 June, so be sure to import your info before then! Hit the link to read more about the new tool.
Springpad Into Pocket [Springpad Blog]