Kingfisher wrote on Feb 16^th, 2011 at 6:22am:

These lines are very slippery and will spin on the spool if you don't.

Funny story about line slipping on the spool. I have an older shimano baitcaster that I always load with braid. A few years ago the line would just pull out by hand like the drag was completely off but it was not. I really got frustrated and put the reel aside thinking that it was broken. A year later I picked up the reel and started working on it. I figured the drag was bad and bought and replaced the drag washers (not a bad as it sounds). Then I reloaded it...the line still pulled out. Finally I had the light bulb go off, the line was spinning on the spool! Took off the line, retied it to the spool and rewound. Works great since. Nowadays they make some spools vented so you can slip line through the spool and tie off.  :)