Could anyone share their experience?

Anyone know a way to secure the main compartment roll-top opening with some sort of lock, for airline check-in, dorm rooms etc? I realize that this is more psychological than anything else, since anyone with a sharp knife and the proper motivation would be able to get into the pack easily, with or without a lock. Thanks a lot.

Tech Specs:

Material:

420D Seam-sealed VaporTight fabric 

Volume:

[S] 4270cu in (70L), [R] 4450cu in (73L), [L] 4640cu in (76L) 

Suspension:

Pre-formed shoulder straps & waist-belt, Monoframe back panel with two aluminum stays 

Hydration Compatible:

Yes 

Torso Adjustment:

No 

Detachable Pack:

No 

Sleeping Bag Compartment:

No 

Rain Cover:

The whole bag is waterproof 

Access Types:

Top 

External Pockets:

2 Front, 1 lid 

Snowboard Carry:

No 

Ski Carry:

No 

Gear Loops:

None 

Ice Axe Loops:

2 

Shovel Pocket:

No 

Weight:

[S] 4lb 14oz (2200g), [R] 5lb 1oz (2300g), [L] 5lb 5oz (2400g) 

Recommended Use:

Extended backpacking in wet weather 

Manufacturer Warranty:

Lifetime