Got a 6x8' piece of plastigrass from Lowes (home Depot) for about $15. Us it in the enclosures where humidity isn't as critical and it would just take an ungodly amount of bark. We also use bark in the smaller enclosures (Forest Bark to be exact - good shtuff). Use both in glass, use neither in tupperware. THe bark is easier to spot clean, that's true, and if your herp REALLY goes, it has somewhere to sink so it wont be crawled through. To a much lesser extent with the plastigrass. Negligible absorbency or aeration with paper. I was surprised the plastigrass caca looked as good as it did - and was that cheap for such huge swaths. Yeah - aesthetics suck, I know - and at some critical mass function will exceed fashion.