Best way to pack rear axle bearings?

Took the 8 3/4 axles out to replace the seals and am ready to install. The bearings are captured and I'm wondering how to repack them with grease.

either just keep squishing it in with your finger or a grease needle works well too.

x2 on the greese needles

I prefer a good hand job myself. nothing cleans the hands off after a day of wrenching like packing fresh grease into bearings!