in my PSK, I carry snare-wire, twine, ranger-bands, a trashbag and superglue. That is all that will fit in my PSK similar to the items you list. In my EDC (PSK + Other pockets and belt hanging items that are always with me) I have a Silnylon poncho/tarp, another trashbag, a space blanket and plastic poncho thingy. So that covers everything other than the bread ties. I carry a bunch of safety pins and the snare wire or the twine should cover those needs while being more durable and having more possible uses. In my BOB, which is intended to allow me to setup medium to long range survival, I have zip-ties of all sizes, and coat-hanger wire. These, when added to my snare-wire, trip-wire, twine, paracord, rope and variety of duct and strapping tape will cover just about any need for holding one thing to another. The full list of BOB items is too large for right now. I may post it later.

Regular rubber bands do indeed degrade with heat rather quickly , OTOH, Ranger-bands last much better. The innertube latex is both heavier and less likely to "dry out" than regular rubber bands.

I don't like the heavy poly since it is heavy. Prefer the lightweight waterproof nylon. I'm not planning on setting up for a 4 year stay under a tarp. If the scenario looks that long I will be making more use of the bow-saw, nails and rope to fashion some more durable shelter.