Brian W.
I have always packed bearings using a quart size Ziplock plastic freezer bag. Just drop in the bearing, scoop or squirt in ample amounts of your favorite grease, zip it closed, and squish all the grease right in the bearing. When finished, open it open and use a rubber glove to grab the bearing and slide it where I need it. Minimal mess and grease loss. You can keep using the baggy until you've managed to tear a hole in it.
Larry,
If you've ever read an oil post of mine, you should know what's coming... I used Lucas Oil Red 'n Tacky #2 grease. It slightly separates at room temperature letting oil get to the good places. But also will easily mix back together as the wheel turns. And yes, your right. High temp grease withstands higher temps.
In my opinion, if your going to use anything other than a multipurpose grease for the greasable spots on a cub, use Marine grade grease. At least it will keep water out better and resist wash out during your cubs monthly wash. (You are washing your cubs monthly right?) kidding....
Edit: you should be filling the hub with grease. Would you rather have $5 worth of grease in there, or any empty space that gives room for water condensation, air, dirt, rust, and other things that are not grease? At $30+ a pair of bearings and down time to fix broken ones, seems like its worth my $$ to keep them filled up.
Also, unless your wheels have 2 grease fittings, how are you getting grease to the other bearing without filling it up. Last I checked, assuming only does one thing, make an a$$ out of u and me...