@Luls is right - The "Neo system" pretty much started with BUgWT. The reasoning behind it is pretty simple (IIRC) it was related to how him and his guild used to organise their loot in their GH, into bps like that. There are a few reasons it was favoured:
- More human - normal people won't open 50 backpacks inside one another to deposit a single item.
- More efficient - you put 4-5 bps of bps in your depot, and it only has to open one container and drop the item onto the last known good slot (typically since opening the bot), and your item is deposited
- Easier recognition of looted items (using the colour coding means that all your stackables are in one type of container, and non-stackables aren't, whereas using XB system people tend to use whatever container they can find)
- Easier to sort for selling (don't have to open a chain of bps and make a mess when organising it, just open 2 and remember which the last was by row / column)
- Easier to buy (since when you use "by with bps" in Tibia, it will give you say 18 backpacks, in 1 backpack, of different colours to one another)
- Easier to count loot (20x20=1 full rig, whereas with XB it's n19 where n is the quantity of backpacks, which is often difficult to count)
- It doesn't generate the pattern "open container, open container, open container" at a fixed interval, like the XB version - though this is probably pseudorandomised now
Reasons in favor of XB:
- It was (once upon a time, and possibly still, IDK) the only way to do it
- As people have suggested, it is less limited in that you aren't required to switch container structure each time you deposit items
- I don't believe anyone here has invested the time to write a script capable of this yet
As far as I'm concerned the old fashioned BUgWT way was the best, but each to their own. Also, I recall when I was writing one script I told Sah that a certain item drops really frequently, I believe it was life rings / rohs but can't remember the spawn (possibly at cults or something), and effectively the resulting decision was to have a second top level backpack of a different colour, which would store all of the rings. We did the same for a few scripts, and for a few items (such as broadswords at dragons). Works very well, since you end up with a bp of bps of broadswords, then a bp of bps of valuable shit that you actually want.