Remove bag of holding explosions when a wand of cancellation is put into them. (Keep the explosion mechanic if a second bag of holding is put inside.) In exchange, make it so that whenever the hero is carrying a charged wand of cancellation, either in open inventory or in a container, it interferes with any bags of holding and prevents them from reducing the weight of items.

Triggering an anti-magic field with a wand of cancellation in open inventory makes both the wand and the trap explode.

When a wand of cancellation is placed into a bag of holding, rather than blowing it up, it instead uses up (all of?) the wand’s charges and turns the bag into a sack.

For consistency, bags of holding should probably turn into sacks when zapped with cancellation as well.

This forces potentially interesting choices on cursed bags of holding in bones files, since now cancellation cannot safely be used to loot all the contents and get the bag too.

An artifact wand of nothing or wand of cancellation which has no special powers other than that it will absorb curses like Magicbane.

Putting a wand of cancellation into a bag of holding does not blow up the bag at all; it cancels the wand (as in NetHack4) and additionally “cancels” the bag by turning it into an uncursed sack (which does not normally happen when zapping magical bags with cancellation).

Not specified whether putting in a bag of tricks or second bag of holding would also have this effect, or whether it would still blow up the bag.

Canceling a wand of cancellation turns it into a random wand.