http://www.mountainhardwear.com/Product.aspx?top=5&cat=61&prod=1902
No mention of a waist strap on the MH sit and the Altrec.com web site says(the italics are mine):
Highly abrasion resistant 100-deneir 192T Cordura nylon fabric in body and base
Removable 1/4-in. EVA backpanel pad
No waistbelt–designed for light travel
Top load configuration with fixed lid (lid has a zippered pocket)
Drawcord closure over main compartment
Front bungee design for attaching external items
Pack folds down into itself for compact storage
Capacity: 1,600 (26 l.)
Weight: 11 oz. (310 g.)
I have looked at them in a store– it is your basic shaped stuff sack with straps.