Utility Cycling - Interior dimensions of 24-gallon Rubbermaid ActionPacker?

The 24-gallon Rubbermaid ActionPacker has outside dimensions of 26 x 18.3 x 17 inches. The interior dimensions are smaller, because the walls have some thickness, the box is tapered toward the bottom, and there are some bumps on the inside of the box. What is the largest rectangle that can actually fit in the bottom of this box?

I'm just trying to make sure I can fit one particular piece of cargo before I actually order the ActionPacker.

Thanks!

I finally found one in a local hardware store - the inside bottom is 19.5" x 14.5". A little too small for my cargo, unfortunately.

That's a lot of taper! I was looking at them to mount on the frame of my Burley d'Lite.

How abot the 35 gallon one? It has outside dimensions of 35.75 long, 17.7 wide, and 19.8 high, according to Amazon's description.

Yes, I'm now considering the 35-gallon ActionPacker. Does anyone know whether or not the lid is removable? That box is long enough to carry my cargo, but not quite tall enough - I'd be willing to take the lid off, if it's removable (and replaceable).

I don't know if it does or not. I was leaning toward the 24 until I read how small it is. One thing is that the width for the 24 and 35 are about the same, so that's still only about 14.5 or so wide inside if it has the same reduction as the 24 you measured.

Yes, I like the fact that the two boxes have similar widths - that means that the bigger box doesn't make a much wider trailer. I have some narrow barriers to get through (posts to keep cars out of bike and pedestrian paths), so that's an important consideration for me.

The cargo I'm trying to fit is a 45-lb audio amp, shaped kind of like a giant pizza box - it's 21.5" X 20.5" X 6", so it should be able to stand on its edge in the 35-gallon ActionPacker, with the lid either off, or propped open against the top of the cargo. I'm thinking that I could use styrofoam or something to keep it upright - I'm not sure that an ActionPacker wall would last long with that thing leaning against its top edge.

I'm also considering just abandoning the ActionPacker idea and going with a flatbed trailer instead.

I've been looking at the options on Amazon, since I have free 2nd day shipping there. The description either there or on Rubbermaid's page says the 36 is sstackable, so that might mean that the hinges slip out of the back for top removal? Not sure how else it would stack, Unless that was part of the description for the ActionPackers in general, and only the small ones stack.

Here's another. (http://www.amazon.com/Plano-Molding-1819-Wheeled-Storage/dp/B000UPGMXY/ref=pd_sim_dbs_hi_3) It has wheels, and cost a lot less than the Rubbermaid AP 35. You could unstrap it, roll it into your gig, and unload there. I don't know what the inside dims might be, because the indentations in the side and ends look pretty deep.

I just realized that there's another option for carrying a large, flat object using an ActionPacker trailer - I could lay the cargo on top of the trailer, and lash it down. I'm just not sure whether or not it would raise the center of gravity too much, leading to a trailer capsize.

The Plano container you linked to looks interesting, and wheels would definitely be useful. I'm worried about the durability of that container, though - one reviewer says the hinge is flimsy, and another says that a wheel came off when he shipped the container.