Sorry about the Avatar, Retread, but I'm Curris.
And the Sphere is moveable. There is an intelligence check, (or a will save), and if you succeed you can move it 10 ft in whatever direction you want. If you want to move it again, it takes another check, and so forth. VERY SLOW TO MOVE.
If you failed, it moves towards you. Still slow, it can be outrun, unless it's blocking your only exits, as is common in dungeons that contain a Sphere. . .
An Amulet of Control Sphere of Annihilation will give you +20 on checks to control it, in 3.0 and 3.5 edition. In 2nd edition, you had full control, but it was still slow.
As for the Bags of holding. . .
Bag of Holding is put into Portable Hole. . . Rift opens to astral plane. Everything within 20ft is pulled into Astral and the rift closes. Bag and Hole Destroyed including all contents.
Portable Hole is put into a Bag of Holding. . . Bag and Hole Destroyed including all contents.
Portable Hole is put into a Sphere of Annihilation. . . Hole and contents destroyed.
Bag of Holding is put into a Sphere of Annihilation. . . Bag and contents destroyed.
Sigh. . . I don't even like 3.5 Dnd. . . . I just know too much about it.