I have the PetBuckle travel kit for Zelda and have to order a new one for Aleks now. It's worked great with her and was the only one I could find at Petsmart that had been crash-tested. Now I have to order it as they don't carry it anymore.

She feels secure wearing it and we haven't had any issues once she got used to wearing it. At first she could back out of it/it would slide around, but we figured out where she was most comfortable and adjusted the straps correctly and she's fine now.
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Zelda Doberman/Chinese Shar-Pei approx DOB Oct 2004, rescued Feb 2009, CGC May 2010
Aleks GSD DOB Dec 2009, adopted August 2010
Molly Doberman/Japanese Chin/Maltese rescued May 2007 at age 6, at the bridge January 2009