I apologize in advance if it seems that this topic has been too often covered or if I seem to be seeking something too personal, but given I am contemplating a purchase that will be sight-unseen I feel that it makes sense that I ask those of you with more direct experience.
I use a backpack on my current commute and its sufficient, albeit very sweaty (and I generally don't perspire much, for comparison). I commute strictly on a roadbike and I have even less interest in panniers than sticking (no pun) to my current set-up. I have pretty much decided that I would go with one of items from the Carradice line, but I don't know which choice best matches my particular needs.
For office days I will generally be carrying a couple of glass containers for food (about the size of typical tupperware), an insulated Kleen Kanteen, clothes (shirt, socks, pants [no shoes]), and all the standard tire repair items. Occasionally, on non-office days, it will be none of the aforementioned (other than the repair items) and maybe my Mac air.
I am thinking that the Nelson Longflap coupled with a quick-release expedition would cover most of my needs, no? I don't want over-kill and thus I have considered something slightly smaller like the Pendle, but there might be days when I would appreciate the space. I guess my big concern is that I do like the feel of a road bike and I don't want to too much compromise that and, moreover, the roads are a little rough (i.e., lots of broken roads, cracks, and potholes). I want to keep my ride enjoyable, safe, and my contents secure.
Any recommendations? Thanks in advance.
Edit: I don't know if it matters, but for reference sake, I will be commuting on a 58' Serotta with a Brooks B17 saddle.