I also use a Halliburton case for storage/travel. My system consists of a 503CW, 50,60,80, and 150 lenses, 3 backs, a PM45 prism, filters, etc. For a minimal setup for walking around I use a Lowepro Pro Toploader 70 which accommodates body with any lens and prism, plus meter and film. For additional backs I have belt mag. cases. I prefer messenger style bags for when I need to carry more gear. I have several sizes, but usually use the small one which will hold body and 3 lenses, etc. Tenba, Lowepro, and Think Tank all make great messenger bags. Hope this helps.