gothic decreased carrying capacity down by 1 slot from the previous elminage: original and it was done on purpose to make everyone have the same number of item slots as characters do in Wizardry; this is to promote more detailed resource management. the only way to have items additional to what chars can carry is to have someone take the mysterious bag ex-skill on char-gen or on class-change.
(you can add it by editing the save games with a hex editor too which you can find out how to do in the american wiki page: http://elminage-gothic.wikia.com/wiki/Game_Mods )
the limited carrying capacity is intentional and you're not really meant to be able to carry everything with you, as when you play w/ the mysterious bag skill you end up with so much overflow loot to sell that you completely break any semblance of an economy. everybody equipped with what they're using, perhaps 9 antidotes and 9 magic maps in the beginning before learning "Venom-Fei", then once you do replacing the 9 antidotes with 9 Full-Potions or 9 Revival tonics or whatever and then everything else blank for loot is more than enough; and obviously throwing away loot you don't need.
you're gonna get so much money you don't really have to worry about it and i would suggest chucking loot you don't need instead of hoarding it for selling.
EDIT: as for stats mid-game onwards (from the royal tomb dungeon and onwards) you can get Ankhs that increase stats by +1 upon use as rare drops but other than that (and a few select items such as the shuriken which increases AGI, or the power axe which increases STR) it's as level ups. the best way to assure a class-change into an advanced class is to make the stats as even as possible from char-gen but this is something you will only learn from playing the game as almost every will always just max out the class's relevant attributes on char-gen.
upon class-changing all stats fall down to Racial Minimums. one way to manipulate the random level up is to save and reload until satisfied.
and yes, this is also something taken from Wizardry.
(you can add it by editing the save games with a hex editor too which you can find out how to do in the american wiki page: http://elminage-gothic.wikia.com/wiki/Game_Mods )
the limited carrying capacity is intentional and you're not really meant to be able to carry everything with you, as when you play w/ the mysterious bag skill you end up with so much overflow loot to sell that you completely break any semblance of an economy. everybody equipped with what they're using, perhaps 9 antidotes and 9 magic maps in the beginning before learning "Venom-Fei", then once you do replacing the 9 antidotes with 9 Full-Potions or 9 Revival tonics or whatever and then everything else blank for loot is more than enough; and obviously throwing away loot you don't need.
you're gonna get so much money you don't really have to worry about it and i would suggest chucking loot you don't need instead of hoarding it for selling.
EDIT: as for stats mid-game onwards (from the royal tomb dungeon and onwards) you can get Ankhs that increase stats by +1 upon use as rare drops but other than that (and a few select items such as the shuriken which increases AGI, or the power axe which increases STR) it's as level ups. the best way to assure a class-change into an advanced class is to make the stats as even as possible from char-gen but this is something you will only learn from playing the game as almost every will always just max out the class's relevant attributes on char-gen.
upon class-changing all stats fall down to Racial Minimums. one way to manipulate the random level up is to save and reload until satisfied.
and yes, this is also something taken from Wizardry.