Best climate-control backpack?

[feral_shade]

Hi, I'm trying to find a good tennis bag, but I'm not really sure what's out there. Here's my criteria:

• backpack. (Since I generally head to the court via bicycle)
  
• small size. (I just carry 1 racket and a minimal amount of gear)
  
• climate control racket compartment. (my local climate is cold (30ºF) and sporadically rainy.)
  
• minimal to no logo visibility. (To me it wouldn't look right carrying a Head racket in a bag with Wilson written in large letters)

I saw that Head offers a white Maria Sharapova backpack, but it doesn't seem to have very many compartments or features.

Has anyone seen any other backpacks they'd recommend?

Thanks in advance for your suggestions.