There are currently 3 types of Gear Packs available to purchase in the Store. These can be found under the Items section of the Store.
Novice Gear Pack - 30,000 Gold
Drops 1 piece of gear with a chance at Legendary. Good chance at Rare.
Journeyman Gear Pack - 22 Gems
Drops 2 pieces of gear with a chance at Mythic. 1 guaranteed Uncommon or better. Good chance at Epic.
Every 70th Journeyman Gear Pack guarantees a Tome of Ascension.
Masterwork Gear Pack - 55 Gems
Drops 3 pieces of gear, Uncommon or better, with a chance at Mythic. 1 guaranteed Rare or better. Good chance at Legendary.
Every 25th Masterwork Gear Pack guarantees a Tome of Ascension.
Gear drops from packs are based on random drop chance, with higher-rarity gear having a smaller drop chance than lower-rarity ones. The type of pack that you purchase influences the types of gear that you're likely to get. Because of the random nature of drops, no specific gear is guaranteed to drop.