A large pack (50+ themes) will usually weigh between 150MB and 400MB. Avoid packs that claim “1000+ themes” – they are often duplicates, corrupted files, or mix of 6.60 and 6.20 (non-compatible).
A is simply a compressed folder (ZIP or RAR) containing multiple CTF files specifically built for firmware 6.60. Instead of hunting individual themes on dead forums, a pack delivers 20, 50, or even 100 themes in one download. Psp Ctf Theme Pack 6.60