there are obviously pros and cons with all machines......

but Scooter.....if you want my opinion on Sanitare versus Kirby.....here it is.....Kirbys are great machine all around even commercially.....ive used a Classic III in a commercial setting and i was great, and there common enough that i don't feel necessarily bad doing so......and as far as Sanitares go.....the only thing i don't like is a 6 or 7 amp Sanitare has ,dare i say a tad too much power and tends to either throw stuff or have little debris just spin around in the fan case and not go to the bag.....the reason for this is most commercial settings have low pile glue down carpet with no pad.....thus not letting the carpet be air washed and, the vacuum not breath as it should........which will make every machine react differently on commercial carpet.....now on the flip side.....if you use a 5 amp Sanitare light, or a blender motor (4.0 amp), or a older 3.5 amp Eureka that just low enough that it does pick everything up......

and as far as packing your Kirby full.....i agree with the fact that it depends on the level of dirt and how often you vacuum.....and also if you wait longer between vacuuming's it will let more dirt accumulate and the process might go faster.....but if your anything like me who has to vacuum 3 time a day that will be a challenge.....but a challenge of will can only make one stronger and can only be more rewarding.....so that just my two cents......use as you wish =)

Miss.Jae

It sounds like a strange proposition if you ask me.  The thought of month after month's worth, or in my case year's worth of dirt stockpiled in the bag until it was packed is disgusting.  The stench alone would be reason enough to not do such a thing.  Plus, as the bag plugged up more and more with fine dust you would be picking up less grit from the carpet.  With the restricted airflow the revolving brush would just be massaging most of it deeper into the carpeting.