I'm thinking of getting the Think Tank Digital Holster 20 to house my 40D + 24-105mmF4, and put the whole Holster in my non camera backpack for my overseas trip. Is the Digital Holster 20
a good choice for my intended use? or i should consider other "toploading" bag? the key criteria is BIG enough to fit my 40D + 24-105mmF4 and SMALL enough to go into my backpack.