When fishing dry flies, it's useful to have both a powder desiccant (Shimazaki Dry Shake, Loon Top Ride, etc) and a liquid floatant ( Gink, Aquel, etc). Rather than fish them out of pockets, this caddy holds both and clips on to a vest or pack loop. This caddy was designed to fit loon's top ride and aquel floatant, shown below with a short piece of elastic cord and a small carabiner.

Knot one side of the cord and pass thru the back of the caddy. Loop around the front and pass thru the second hole and knot.

It should fit snuggly below the cap of the Top Ride.

After making sure your Top Ride is capped tightly, flip the caddy over and insert the Aquel with its cap off.

Then tighten the Aquel cap.

Insert the small carabiner (or other attachment: cord, snap swivel, etc) thru the top hole and attach to your vest or pack.