I have an old LL Bean bookbag/backpack which I intend to convert into a fair LF travel bag. Here's my scheme: I've gotten some closed-cell foam (chair padding) cheaply from the fabric store where my wife buys her sewing goods; the foam I have is 1" thickness. I intend to cut it to fit the front, back, bottom, and sides of the large main compartment, then contact-cement it into place. My Crown Graphic will fit easily into that compartment, along with room for other stuff (jacket, dark cloth, etc.), and the outer pockets will be fine for loupe, meter, film holders.
Here's the key question: has anyone ever had problems with this type of foam breaking down over time and leaving foam "crumbs" all over everything? If so, any suggested solutions? Thanks in advance.