This normal-seeming pouch is actually a strongly magicked item which can contain up to 3,000 gp of weight in 30 specially constructed pockets within it. 

Each pocket, in turn, holds a maximum of 100 gp weight, or 1 cubic foot of volume, whichever is reached first. 

Better still, this device enables the possessor to open the pouch and call forth the item(s) desired. Merely speaking the name of a desired object causes it to appear at the top of the pouch, ready for instant grasp. 

Of course, these items are similar to bags of holding and portable holes (qqv), and the strictures about placement within such magical spaces apply fully. 

The pouch weighs 10 gp empty and 40 gp when filled.