STALKER Clear Sky
A flash drive mod, get them at the start of a new game off the Clear Sky trader. Gives you 10,000 RU to start off with as well.
This mod lets you buy for free, the flash drives for upgrading weapons and armour from a trader. You can buy the flash drives from the traders.
This is a relatively simple mod that enhances the function of the various consumables in S.T.A.L.K.E.R.: Clear Sky.