Here ya go:
Sam's Club - Leather-Look Rolling Catalog Case
I've had mine going on 3 years now. It's held up pretty well. It'll fit all that you need. Even if you need to stick some food and some clothes in there, also all your charts. It'll fit in the 145, just make sure the wheels face in, they hang over the side of the bag spot. It's hard for the seat to slide all the way over, but it'll go with some force. The bottom on mine is getting a little worn, but it's held up well for $50 for 3 years of use.
Just google "Rolling Chart Case" and find the best price. That should fit your criteria.
Cheers.