you can get a full 300m of saltiga surf 30lb onto the 5000 spool and have room to spare, id say enough for another 50m at least, i didn't use backing but i will next time. I also got or 180m approx of 50lb fins which i removed. its a real dilemma because of the ferocious drag (for its size) of 29lbs. I think the saltiga 30lb is really a PE1.5 or maybe PE2.
My plan is to keep the 30lb on the 5000 spool for plastics fishing for snapper, rat kings and jewfish and even SB tuna, and then later on get a 6000 spool and load it with PE4 for light stick bait work on a saltiga 80TN for Kings, where more drag is required.