Honestly, when we needed to black it out because there was a kiddo napping we would just throw a towel over the screen door section to block out the light. One less thing to pack and store. Worked great.
If you are even remotely handy and want a semi-permanent solution, you can take out your window trim on the inside and install a piece of reflectix, sandwiched between your window on the outside and your window trim on the inside.
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