You can use whatever straps you like, but I find these work pretty well: https://www.amazon.com/gp/product/B01D8L3IUG/. That is about the right size for bicycle stuff, although you might also consider the 60" ones. I just have them wrapped around my cargo rack all the time, in case I need them.

If you use bungees, I recommend finding some flat ones; they move around less.

A smaller lashing strap, probably a thinner, lighter, non- than the one you use for your pick could also be useful.