Filson's roll top bag. I've had it for around six years. The twill has broken in nicely and has handled admirably even in downpours without so much as getting anything wet inside.
Filson Rugged Twill Rolling 4-Wheel Carry-On Bag –
Filson Rugged Twill Rucksack review
Filson Zippered Rugged Tote Bag Review - Best Bags For Men
Signature Materials: Rugged Twill
Filson Bag Thread: With Pictures, Page 1553
Filson Large Rucksack Otter Green, classic rucksack with style and
Carryology
Rolling Carry-On Bag - Navy
All about Filson
Rugged Twill Luggage, Bags, Accessories & More
Tin cloth vs Rugged twill) Filson roll top backpack five-year
Filson Bag Thread: With Pictures, Page 1553
Filson's Handsome Rolling Carry-on Bag is Made of Rugged Twill