The Pack Jump is a glitch in Banjo-Tooie. It allows Banjo to jump in the air while using the Pack Whack. This double-jump gives Banjo a total height that exceeds his Failed Flip, as well as allowing him to jump large distances, climb near-vertical slopes, and even nab items in alcoves above water that would normally force Kazooie to use the Turbo Trainers to get them.
Usually, the move is performed by pressing 
to jump and 
to use the Pack Whack, followed by again while Banjo is swinging the pack.
A variant of the trick involves repeatedly using the move against a sloped surface, allowing Banjo to climb steep slopes. There are two ways to do this. The first method is to alternate between and quickly, allowing speed, but may wear down the player's hand. The second method is to press and wait for Banjo to completely (or almost) finish the move, then press to jump and repeat.
Although it is considered a glitch, the Official Player's Guide to Banjo-Tooie lists it as a real move.
Abilities from Banjo-Tooie 
| Spiral Mountain (Pre-learned): | Beak Barge · Beak Bomb · Beak Buster · Climb · Dive · Egg Firing · Feathery Flap · Flap Flip · Flight · Forward Roll · Jump · Peck · Rat-a-tat Rap · Shock Spring Jump · Stilt Stride · Talon Trot · Turbo Talon Trot · Wonderwing |
|---|---|
| Isle o' Hags Worlds: | Airborne Egg Aiming · Beak Bayonet · Bill Drill · Breegull Bash · Breegull Blaster · Claw Clamber Boots · Clockwork Kazooie Eggs · Egg Aim · Fast Swimming · Fire Eggs · Grenade Eggs · Grip Grab · Ice Eggs · Split-up · Springy Step Shoes · Sub-Aqua Egg Aiming · Talon Torpedo |
| Banjo-only: | Pack Jump · Pack Whack · Sack Pack · Shack Pack · Snooze Pack · Taxi Pack |
| Kazooie-only: | Glide · Hatch · Leg Spring · Wing Whack |