Is the back panel on this pack rigid or flexible like the Speed pack. When you stuff the Speed pack bulges into your back making it very uncomfortable.

Tech Specs:

Material:

[body] Velocity (420D nylon); [reinforcements] nylon (630D) 

Support/Suspension:

reactiv XP suspension, aluminum frame 

Waist-Belt:

yes, removable 

Hydration Compatible:

yes 

Reservoir Included:

no 

Rain Cover:

no 

Access:

top 

Snowboard Carry:

no 

Ski Carry:

no 

Climbing Gear Loops:

2 

Ice Axe Loops:

2 

Shovel Pocket:

no 

Weight:

[small] 3 lb 12 oz; [medium] 3 lb 12 oz; [large] 3 lb 13 oz 

Volume:

[small] 2929 cu in; [medium] 3050 cu in; [large] 3173 cu in 

Recommended Use:

ice climbing, alpine climbing, mountaineering, trekking 

Manufacturer Warranty:

1 year