Boba Fett's jet backpack (or jetpack) is considered a Mitrinomon Z-9.
This version is mostly a solid green color. See reference photo #1.
Boba Fett's backpack consists of a missile, missile boost charge, missile launcher, missile targeting rangefinder, stablizing gyro, fuel tank, directional servo, activation button, and directional exhaust nozzles.See this reference picture.
Flynn O'Connor suggests:
I have heard that Super Soaker has a backpack for one of it's larger guns. This can be converted to a jet pack by making the launcher out of tubes and Cardboard cones painted red... Also two Styrofoam balls with two cones coming out the bottom attached to the lower corners of each side will make a reasonable pack. It can be painted in much the same way as the armor.
I made mine from scratch, using cardboard boxes, a 2-liter bottle, and "odds and ends." Painted right, with the right amount of detail work, you can make just about anything look like it should.
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