Wat do you think the ideal BOB (Bug Out Bag) bag is?

Please contribute any other bag ideas in this page.

I am currently tosed up between two bags for my BOB:

5031 Three Day Pass (36 Litre)	5016 Bugout Bag (55 Litre)
Technical pack with built-in hydration system compatibility. Cargo pocket with MOLLE panel. Features: padded non-slip shoulder straps, adjustable everything, waist strap, organizer compartment, and front zip compartment gives that extra features that everybody needs.	Carries like a travel bag, yet coverts to a backpack in seconds. The expandable main compartment has a large opening that allows packing and re-packing easily while on the go. Padded straps for comfort, with internal frame allows for stability during transit. Feature: 600 Denier Poly/Canvas, Stress point reinforced stitching, Padded tuck-away straps, Converts to backpack, organizer panel, Padded carry strap, Name tag panel, Luggage tag.
Dimensions: 15 x 8 x 20 in. Weight: 4.5	Dimensions: 21 x 9 x 13 in. (Unexpanded) Weight: 6.5

The link for these bags, and others, is http://www.bugoutgear.co.uk/bug_out_gear_packs.htm (It is a UK website)