Lyn, maybe you'd like the Speck covers. They're designed to fit around the reader, no straps or anythnig:
http://www.speckproducts.com/ereader-cases.html
Unfortunately, they only still seem to have cases for Kindle and Nook. They used to have Kobo cases too, but that page has gone missing for some reason. You might be able to find some Speck cases for Kobo elsewhere though. Here's an example:
http://www.amazon.com/Speck-Products.../dp/B0065GAU5S