While I have not used the Worrgames pack I can vouch for the Neotech.
And while I do play for Tremmor, I only play for the kidz which means I didn't get a free pack.
However I gladly paid for it as they are fantastic.
Mega comfy, no dropped pots or movement of the pack, and super-tight when empty. Also they are adjustable in number of pots and position of pots so you can tailor them to your exact needs, much like the JT pack previously mentioned
I was warring it at KOTH even though I wasn't taking a pot out most games, to be honest I hardly noticed it was there.
These packs rule!
Keith