Requirements:

DURABLE, as in both field points and broadheads.
PORTABLE, as in it will come inside during the week, then get carried out in the the "park"/field for weekend shooting.

Could care less about looks.

V,
I keep styrofoam because I don't shoot anything but broadheads, but they are messy. The "blocks" I have used are a pain...either tear up too easy with broadheads or field tips won't pull out easily. If I needed an easily transported target that was user friendly, I'd chose one of the 3-d targets. They work well with all points and come in lots of sizes.

I've done styrofoam before... and yeah, it's messy as hell.

Can't see storage of a full-size 3D target being too easy right now, and figure that if I'm chucking arrows at a lifesize deer target, I WILL have the cops come investigate.

Maybe one of the little pigs?

Morrell's Six Shooter.
I've been using one for years now. I take it to elk camp and we practice between hunts.
It's 21"x21"x21" and water proof. Fairly cheap @ $55. BT

I have used the block target for a couple of years I like it broadheads do cut them up you get little slivers of foam every time you pull your arrow but they still stop arrows. Have had the same one at my dads house for 3 years know and it still works fine.

Got this one:

That'll do fine!