Originally Posted by
noglider
A lot of cyclists say backpacks are the worst. I don't quite agree. I've commuted with one. Lately, I toss my backpack into a basket I've attached to my bike, and I do prefer not wearing it.
Panniers are great for when you're riding, but carrying them off the bike is awkward, and they don't stand up well, either.
A backpack that feels fine for walking might be uncomfortable on a bike because the cycling position pulls your shoulders forward whilst the backpack straps pull them back.
I second the backpack/basket combo. The backpack is super convenient to carry and put into the basket. All my tools live in a pocket of the backpack. Additionally, if I come home with something (today it happens to be some delicious bakery items), I can always put it in the basket and wear my backpack. The OP however, seems like he is travelling pretty light. I bring thermos of coffee, laptop, tools, lunch, every day.