I know this thread has already found its answer in the wheelie-bag...
I went through this a year ago, initially looking at the "cool" gear from Dillon and 5.11. I didn't want to shell out $75 or more for what amounted to a glorified book bag. I ended up going to my local Target store and found a soft sided fishing tackle box. I've got pockets for fired brass to keep it separate from the main compartment. I can fit about 300 rounds of .308 in the thing (more than I would choose to carry), or about 900 rounds of .45acp.
The typical loadout I put in it is 50-100 rounds of handgun ammo and 50-100 rounds of rifle ammo, one handgun, a bore snake for each caliber I shoot, eye protection and ear protection. Most of the time I can fit my targets in the bag too.
I think it cost me $10, IIRC.