Suggestions for Weight Trim Pockets that can be attached directly to Backplates (to fit between BP and Wing in a SINGLE Tank kit)

[Tracy]

I have sewn weight pockets on the upper rear portion of my wings. Works great for me. Outside of the subgravity ones, I haven't seen many specifically made for what you are doing since Tobin quit making them.
A weighted STA would be the easiest option, but not ideal for traveling.

 

[Fox800]

Here's another interesting idea: Trim pockets long pair, black (max. 6kg/pc) | Tecline Catalog