In 5 years or so since I registered for SDN, I thought I had seen everything. This has got be be one of the dumbest threads I have ever seen. Seriously? Who gives a s*it what people do with their books or how they carry them? If you find yourself overly concerned with this issue, then YOU, yourself, are probably one of THOSE premeds everyone on this site is always railing against and hates.
A couple of points to consider:
1) to begin with, being "premed" means nothing and is nothing to brag about. Any ***** can give himself that title. There are no prereqs to being premed...remember, statistically a greater portion of them will not make it into medical school compared to those who will.
2) by the same token, carrying textbooks for ochem, physio, etc. is NOT a bragging factor/tool, and does not make you cool. If anything, it is a clear signal that you spend a greater portion of your time in the library that out being social/getting laid/having fun, etc.
3) many times, I agree with those you say you have a lot of crap to carry in your backpack. Rather than carry a laptop, notebooks, and 3 massive textbooks in your bag (essentially it's like walking around with a 35 pound dumbbell on your back at all times) it's sometimes more convenient to carry a book in hand. Who cares? Again this doesnt prove/serve as bragging rights to anyone. Anyone who is "impressed" by an ochem book is a *****.
4) who do you only see science books? for the most part, because the only students who carry large heavy books around ARE science people, engineering students and law students. Actually law students probably take the cake because every one of their law bibles as I call them is a freaking 15 pound 2000 page tome, and they usually take 5 classes or so at a time. You often see law students with a full backpack, and one under each arm. They're also the group where i've seen the largest number of rolling bags i guess for that reason. Most other majors get by with printouts, thin books and a 2 pocket folder full of handouts.
Once you get to med school, everyone is on the same page, there really are no books, and there is nothing to differentiate you all. It's like elementary school all over again. So there.