Anker Sport XL Molle

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:2638364.

Because I designed this to attached to a backpack, I would pick a material that can handle some flex, PLA+, PLA Pro, PETG, ABS, Standard PLA may snap considering all the pulling and flexing of the object.

I use bungees, but you can also use just basic office rubber bands too.