How to make the roof top canvas bag hold its shape?

[stioc]

I'd like the Keeper canvas bag I use on the roof top to hold its rectangle shape (4"-6" high) is good enough. I'm thinking of finding/building some sort of inserts but not sure what to use. Something made out of file folder/binder type material or those white honey comb type sheets used for the faux ceiling and even packing material? Anyone got any suggestions?

 

[Boog2001]

I think you'll need something fairly strong. What about 2" foam board? You could cut it into strips and build a perimeter box to put inside the bag.

I just picked up a bag myself. Might have to try this.

 

[stioc]

That's a great suggestion but those foam boards are fairly rigid so they'll probably snap every now and then. I was thinking of something that may take some bending yet springy enough to pop back in shape.

 

[h2os2]

Maybe hardboard masonite? Or 1/2" acrylic plexiglass? (maybe thicker plexiglass so doesn't crack)

 

[97tjguzzy]

maybe its a weird question, but why does it need to hold its shape?

 

[stioc]

^ Ah good question. It would just make my life a bit easier when putting things in it while it's on the roof rack. Right now standing on the rock sliders, holding on to the roof rack and trying to shove a camping chair in it I'm aways wondering if it's all the way in or if I'm going to poke a hole in it etc. Said another way with a rectanglar shape it'll be more like putting things into a box as opposed to say a leaf bag

 

[h2os2]

If you want to stand a little higher and not want to do a balance beam of sorts on you sliders while holding you rack. Thule makes a accessory step http://www.etrailer.com/Accessory-Step/Thule/TH232.html?feed=npn&gclid=CK_-mvCxlLUCFe5xQgodxUYA4Q or there maybe a cheaper one like that out there.

 

[Mc Taco]

I made a frame for the Trasharoo out of PVC to help hold its shape. Same thing might work for a roof top bag.

The frame made from PVC pipe.

Two angles of the front.

The backside with temporary attachment.

 

[stioc]

^^ McTaco - I like that a lot! I'll have to give your idea a try, thanks.