Originally Posted by
cyccommute
It's hard to tell from your picture but it looks like your bag expands. Does it have a second zipper on the top that goes all the way around the bag? Even if it doesn't expand, it's not that difficult to get 10 lbs of potatoes in a 5 lb sack. Put anything small...socks, underwear, gloves, etc...in the side and rear pockets. Put larger stuff in the top compartment and then roll everything else as tightly as possible in the main compartment. I've been using rack bags exclusively for about 30 years...I hate using panniers...and I live in an area where the temperature can be 20 F in the morning and 75F at night.
If all else fails, I carry a rack strap like
this one to bungee stuff to the top. I don't use it that often, however.
It does expand and I do that here and there depending on what I need to shove in there. I'm working on not packing so much "hey I might need this!" stuff so I can have room for what I ACTUALLY need. Hard to do here and there.
I do have a Burly Travoy that I use when I need to take several days worth of stuff in but I don't pull it just to put a jacket on. I think the combination of freeing up room in my rear bag and using a bungie strap will get me by.
I thank everybody for their input.