He mean backpack i think, and this backpack can only take one item type like "claws of attack +15"
like Silkroad(mmorpg) there is a horse for trade can only take items for traders you cant put your items to horse
That sort of contradicts what your first post said.
"One bag system" = An inventory of some sort
"that only carry one item type" The key words here are "One item type". Thus it is assumed you only want it to be able to contain one item.
To be more specific, an Item Class is a group of items. Charged, Purchasable, Artifact, Permament, Misc, Campaign, Powerup. Which each in turn hold Item Types, which are individual items. Belt of Giant Strength, Red Drake Egg, Health Stone, Heart of Searinox.
Finally finding about some of the bots that are flooding the users online - bytespider apparently is a huge offender here - ignores robots.txt and comes in from a ton of different IPs
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.