I have a fixed vertical line that can be ascended/descended. I need a bag (a bucket with tools, actually) when I'm hanging mid-air, and need to move it up/down. The bag is over 20 lbs / 10 kg so I definitely don't want to attach it to me!

This is what I invented, using a separate haul line. It works but it's not very comfortable to use and maybe there's a better (and safer) way to do it?

***Principle of operation***

The load is locked in place with a prusik. When I want to move the bag, I pull on the secondary prusik loop, release tension from the main prusik and slide it up or down, then tend to the "pulling prusik". Repeat as required.

[![My rig](https://i.stack.imgur.com/0snDI.jpg)](https://i.stack.imgur.com/0snDI.jpg)

**Pros**

* Simple
* Easy to rig
* No special equipment required (a pulley can be replaced by a
screw-gate)

**Cons**

* You need to pull the whole weight of the bag each time you want to
move
* When you're tending the main prusik, the bag's weight is held by a
hand/foot in the pulling loop; if you let it slip, it would be ugly (fingers jammed / the bucket shoots up and probably spills over its content)
* Lowering the bag is not very gradual (sometimes it's shock-loaded if
I release the pulling loop too quickly)
* Disassembling the rig is tedious (you need to pull the bag all the
way to the top, dock it, untie prusik, clip it out from the biner,
then belay the bag down). A simpler option is to lower the bag with prusiks to the ground and then untie the prusik, but that's not always feasible.