I know it's not DIY but this is where I get my bags, much cheaper than the aquarium specific ones, internal plastic ring, and don't cause your skimmer to go nuts.
Bought 50 of them.
http://filterbag.com/PE100G1S-PP-Pla...ing-p1879.html
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Hobby Experience: 9200ish gallons, 26 skimmers, and a handful of Kent Scrapers.
Current Tank:
Vortech Powered 600G SPS Tank w/ 100gal frag tank & 100g Sump. RK2-RK10 Skimmer. ReefAngel. Radium 20k.
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