Ya, for me a dimensional space would just have a bit of air, from what may pour in when you open the bag. While I am saying stuff won't decompose, mostly the way I am seeing it is that the rate of decay would be severely reduced, and using the "its magic!" mentality, counting it as being basically the ultimate refrigerator with long lasting food. While I'm detail oriented, I do try to give the player a break once in awhile. ;)