1-2

Randomness - Items remove from the bag come out wet.

3-4

Randomness - Emits an almost silent, but room-clearing fart when opened, that is smelt by everyone within a 5' radius of the person opening the bag.

5-6

Randomness - Bag emits smoke when opened. Objects removed are unharmed, but smell of smoke.

7-8

Randomness - Glows in the dark, illuminating a 5' radius around the bag with dim light.

9-10

Randomness - Has an obvious repair. (Since pierced bags of holding are supposed to rupture and scatter their contents to the Astral Plane, this is quite curious)

11-12

Randomness - Is made of two different materials, the one previously chosen as well as this:
Roll on "Bag of Holding Outer Shell Material"

13-14

Randomness - Items removed from the bag come out covered in frost.

15-16

Randomness - Makes a loud whispering sounds in an unkown language when it is open.

17-18

Randomness - Emits a bright light out of the opening when opened.

19-20

Randomness - Items removed from the bag are covered in a layer of ash.