First: stop wasting money and space on 'hi res' audio.
Second: do some blind tests to see if you can actually tell the difference between flac and mp3 (either 320 or vbr0), chances are you can't.
Congrats, you can now store 3 times as much music.
If you have internet access (e.g. you want to listen to music at work on a computer), Google Play music will allow you to store 20,000 tracks online for free and stream them. I think it supports up to 320kbps (it will convert flac automatically for you before uploading).
I can hear difference between MP3 and Hi-Res... But then I can't hear any difference between 16 bits and 24/96 or 24/192 !
--> is it normal for a pair of 50 years old ears ?
Anyway, "by security" I download 24/96 instead of 16/44 when available, but NEVER 24/192.