Do I need a pack this large for a week long hike once a year & several weekenders?

Tech Specs:

Material:

210D Nylon diamond ripstop & 150D poly stretch laminate 

Volume:

5000cu in (82L) 

Suspension:

AeroBeam (breathable, padded back panel, hip-belt, shoulder straps) 

Hydration Compatible:

Yes 

Torso Adjustment:

Yes, 16-21in (41-53cm) 

Detachable Pack:

No 

Sleeping Bag Compartment:

Yes 

Rain Cover:

No 

Access Types:

Top 

External Pockets:

1 Front, 2 water bottle, 2 side, 2 hip-belt 

Snowboard Carry:

No 

Ski Carry:

No 

Gear Loops:

None 

Ice Axe Loops:

Yes 

Shovel Pocket:

No 

Weight:

5lb 9oz (2500g) 

Recommended Use:

Long backpacking trips, expeditions 

Manufacturer Warranty:

Lifetime