I bought a customized Porter 3400 recently thinking it would be the perfect "do it all" pack but alas it just doesn't fit me very well. .
-150 Denier Hybrid Cuban for the entire pack. Most of the HMG packs are made of 50 d hybrid. The 150 d has a thicker "face" fabric and is more abrasion resistant. Its pretty burely stuff.
-Plastic Framesheet. This is the same frame sheet used to boost the Porter 4400's capacity to 60 pounds. Normally the smaller packs don't have it. I had it put in because I thought it might come in handy for hauling heavy loads of water in West Texas.
-NO hipbelt pockets. This actually isn't a custom feature but so many people order hipbelt pockets I thought I'd mention they aren't there.
The pack has been loaded up and taken outside for a quarter mile walk. There might be one or two dirt stains on the bottom but other then that its in new condition.
Asking $310 shipped. Its a great pack and I really wanted to like it because its perfect for what I plan to do next year but it just doesn't fit as well as other packs.
I can provide pictures later if asked. It looks just like a normal (white) Porter.
Edit - Size Large