I went out to the garage and checked. I bought the flag here in town but here is the company that puts them out. Click here:
Firestik flagMine is the 4 foot model and came with a mounting base which I secured to the yak with stainless steel hardware. The MSRP is 15.99 on the website.
Also, I rigged up a PVC pipe and secured it to the milk crate as a mount for the aft navigation light. The light is a
Tecktite MK III and is an adaptation of the
Kayalite. The light fits inside the PVC after slight sanding of the light's plastic body. I topped the PVC with 3M Solas reflective tape and refelective orange tape from Ace Hardware to give me a bit of safety comfort after the sun goes down.
I purchased my milk crates from the Duluth Trading Company so that I would have some that are not stamped with "PROPERTY OF...DAIRY".