I use a number of case logic products

http://www.caselogic.com/search/index.cfm?N=4011+20026010

to help store various smaller sized items.

I also have the Home Depot $1.99 orange tote bag wrapped around the back of one headrest to hold grocery or other shopping purchase items.

2005 AWD Escape Hybrid
Best Interstate tank trip MPG 39.02 (scangauge II) for 402 miles on I-70, 10.3 gallons used over mostly flat terrain. Aug. 2007

Best Interstate tank trip E30 MPG 34.6 for 271 miles along I-80 in Indiana and Ohio. May 2008

Best multiple road tank trip E30 MPG 36.2 for 202 miles in Southwestern Pa. July 2008.