Have you ever wondered what is inside those massive staff bags caddies lug around on the professional tours? We have you covered. Golf Digest’s revamped “What’s In My Bag” treatment deconstructs everything inside a player’s bag, from the tiniest ball marker to the supersized driver. Here, four-time PGA Tour winner and 2017 Players champ Si Woo Kim—playing in the Presidents Cup this week for the fourth time in his career—gave us full, unfettered access to his bag. Enjoy the eye candy.
GEAR
Ball: Callaway Chrome Tour Driver: Callaway Quantum Triple Diamond (Fujikura Ventus Black 6X), 8.5 degrees 3-wood: Callaway Quantum Ti, 15 degrees5-wood: Cobra OPTM LS, 17.5 degrees Irons (4): Callaway X Forged; (5-PW): Callaway Apex MB Wedges: Callaway Opus SP (52, 56, 60 degrees) Putter: Odyssey TRTL prototype
DIAMONDS ARE A GUY’S BEST FRIEND 
JOHNNY JAFFE
Kim doesn’t change clubs on a whim, so it was notable when he switched to Callaway’s Quantum Triple Diamond driver earlier this year. Better performance on off-center strikes led to the upgrade, and he improved from 30th to 20th in strokes gained/off the tee.
EARLY ADOPTER 
JOHNNY JAFFE
As one of the first players to use the chunky Odyssey TRTL mallet, Kim fine-tuned the turtle-shaped head with strips of lead tape.
TEST THE BREAKS 
JOHNNY JAFFE
On practice days, this electronic level allows Kim to verify the slope on the greens compared to what he’s feeling with his feet.
MARKING TOOLS 
JOHNNY JAFFE
Kim’s ball markers include one from Merion Golf Club, a 500-yen coin and a bronze marker with his name stamped on it.
GOOD MEMORIES 
JOHNNY JAFFE
Winner of the Players in 2017, Kim personalized his Callaway Opus SP lob wedge with the tournament logo and year he won.
