Coffee bags make slightly better coffee than instant crystals, since the brewing process is closer to that of a standard drip coffeemaker. Instant coffee crystals often taste powdery - not like real coffee at all.
Instant crystals are horrible. Coffee bags=ground coffee? Have you tried a single serving drip system? Like Melitta's "Ready, Set, Joe"? $5, uses groundcoffee and you get great cup of joe!