There is bonded pair Smokey (who just barely fit), age ~3

basket3 by friend2kitties2011, on Flickr
And newest boy Louie, age ~2

basket2 by friend2kitties2011, on Flickr
And bonded (but still humpy) pair Snickers, who kind of didn't want to cooperate because he doesn't like to sit still, but he did, age 2

basket1 by friend2kitties2011, on Flickr
And MoonPie, who doesn't like to cooperate or sit still at all, and gave me a half a second to get a photo -- age 2

basket4 by friend2kitties2011, on Flickr
-- before he did this, and assorted other basket acrobatics. He looks more ferret than piggy. Silly.

basket5 by friend2kitties2011, on Flickr
So that's a little intro, and a little window into their personalities too.
I wanted to take them outside yesterday for grass, but I was too tired to take piggies to grass, so instead I took the grass into them.
They were delighted because absolutely no work was involved for them whatsoever!