The new 25th backpack and JUMP pack pegs are too small for ARAH and New Sculpt holes.
What if someone cast a converter?
It would be a size that would fit old ARAH holes and then on the other side have a hole for the 25th peg. Then, you could convert all your 25th backpacks into usable for the older figures.
To make old backpacks work on 25th figures you'd have to cut off the big peg and replace it with a 25th size peg. Once you do that you could use the new converter to make it usable for ARAH again.

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HAWK
"He is keenly intelligent and perceptive and quite capable of totally selfless acts in support of his team-mates. An excellent leader!"