it says it comes with a hydration sleeve, is that the sleeve that holds a water bag (similar to what's found in a camelpak), or is it the water bag itself. in other words, do I need to purchase the water bag in addition?

Tech Specs:

Material:

Nylon 

Volume:

1600cu in 

Waist-belt:

Yes 

Hydration Compatible:

Yes 

Access Types:

Top zip, side zip 

Pockets:

1 Main compartment with organizer pockets, 2 waistbelt pocket, 1 for shovel & probe, 1 fleece-lined goggle or sunglass pocket 

Snowboard Carry:

Yes 

Ski Carry:

Yes, A-frame or diagonal 

Ice Axe Loops:

2 

Shovel Pocket:

Yes 

Weight:

2lb 13oz (1276g) 

Recommended Use:

Ski touring, carting your gear around in-bounds, taking a hike 

Manufacturer Warranty:

Lifetime