Disappearing Act

I did all of my packing for Peru this weekend. After laying out what seemed like a ton of gear I thought there would be no possible way to fit it all in my baggage allowance of 2x 23kg bags. This includes 2 sleeping bags, 2 tents (megalight for a cook tent), a pair of gigantic boots, snow stakes, ice axes, climbing gear - basically lots of heavy metal stuff.
So I started loading it into my two duffels and amazingly the bags just completely swallowed the gear! They've come to about 11 and 12 kgs. I guess its time to start throwing in some of the extra "maybe" items. And perhaps a second pair of underwear.
The blue and yellow duffels are Kathmandu bags so my only concern is that the bottoms will fall out and all my gear will be strewn up and down the Santa Cruz valley for some very lucky trekkers. I guess I can take Romaric's perspective on Kathmandu gear - if the bottom falls off then it is lighter and therefore better!