LordZ: I'll just go ahead and say this. There's only really two inventory systems that should ever exist in a PC game because anything else is flat out retarded. I've played hundreds of games and I can't think of a single one that could be an exception to this rule.

1) Unlimited Sortable Scrolling Inventory - Suited for games that have lots and lots of items and games with item crafting. Putting artificial limits on inventory space in a game like this is not challenging, it's frustrating and only a total douche would do it intentionally. An alternative is to provide a "chest" type feature where you can store your ridiculous amount of items that aren't likely to be needed during a quest somewhere convenient other than on your character. The general rule of thumb is that the number of inventory slots should always be greater than or equal to the number of items available to loot. Failing to uphold this rule is not an option.

2) Limited Inventory - You only have a very specific number of item slots because they match up exactly with the number of items you'll find throughout the entire game. This type of inventory works best for shooters, console games (where game save space is finite) and those click adventure type games (like Phantasmagoria where every item has a specific use and there usually is no combat at all).

Anyone trying to argue realism in relation to an inventory system needs to immediately and publicly flog themselves for being a complete moron. Games are not reality and there's nothing realistic about inventory systems. The moment I can interact with digital items in all the same ways I can real items, I'll accept that you finally have a reason to argue realism in relation to an inventory system. In the case of a realistic inventory system, you should only ever want to carry around items that are useful and should always have a way to carry the stuff you need. It should be obvious to the player which items are useful and which aren't worth carrying.

Generally speaking, realism can be very important to the story, characters, setting and anything related. However, when it comes to game mechanics, realism only matters as far as whether the mechanics are considered intuitive and convenient to the user. Beyond whether it's intuitive or not, realism really has no place in game mechanics and trying too hard to shoe horn it in will only hurt the experience.

I'm easily willing to suspend my disbelief when it comes to how I interact with a game, so long as the interface is pleasant. Everything else about a game is a more complicated matter and realism can either hurt or help depending on circumstances.

einarabelc5: Can you answer this:

How is it possible than in two rundowns of the Prologue I end up at the beggining of act 1 with 250 in one case and 300 in the other for Inventory limit in Kilograms?
Moreso when I even have more items in the 300 case.

LordZ: I'll just go ahead and say this. There's only really two inventory systems that should ever exist in a PC game because anything else is flat out retarded. I've played hundreds of games and I can't think of a single one that could be an exception to this rule.

BemaniAK: As an avid fan of STALKER, I just thought I'd say this post is silly.
In a game like STALKER, weight based limited inventory is a huge plus and greatly affects how the game is played in a positive way.

Less so in an adventure RPG.