Extradimensional Spaces and the Lack Thereof (GAP)

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Being outside of real space and time, the Astral lacks all dimension. Not surprisingly, then, it offers no access to extradimensional spaces commonly accessed by spells and magical items. The spells listed in Table 1 will not work because of this restriction. Likewise, the common magical items listed in Table I are also worthless pieces of junk while on the Astral. Any similar item also will not work. As a general rule, if something is enchanted so that it is larger on the inside than the outside, it works by accessing extradimensional space, and thus fails when on the Astral (although not always — the DM has final say in this matter). 
 Table 1: Spells and Magical Items Accessing Extradimensional Space
Spells 	Items
Deeppockets 	Bag of devouring
Extradimensional detection* 	Bag of holding
Extradimensional manipulation* 	Bag of transmuting
Extradimensional pocket* 	Girdle of many pouches
Maze 	Heward's handy haversack
Mordenkainen's magnificent mansion	Mirror of life trapping
Rope trick 	Portable hole
Seclusion* 	Pouch of accessibility
Transformation" 	Rod of security
: * These priest spells are only affected if cast from a scroll or a magical item.