Comments about Giottos Giottos Large Deluxe Double Sandbag with Velcro, 1 kg (2.2 lb) x 2:

I have 4 of the smaller ones (deluxe), 1 small (regular), and 2 large (deluxe). I recommend the deluxe model because it has a nice long velcro strap that tucks under two flaps when not in use; which means it attaches to just about anything. The inner bags for the sand help keep things tidy when you're putting them together - btw, you can buy sterilized "play" sand at just about any hardware store at 50lbs for $5-$7.

The large ones are a bit unwieldy and overkill for most applications and the seams sag a bit under the extra weight. I use the regular model with an attached hook on the down-post of my tripod and the others mainly on lightstands for both large monolights and half-a-dozen speedlights when I'm shooting on the run.

All and all they're perfect for the intended task - stability. I used to make little -3lb "bombs" wrapped in black Gorilla tape with a clothesline loop. They worked great and didn't look too bad. But as more and more Art Directors and Clients attended my shoots I could tell they expected the higher-tech dog and pony show and these fit the pro-from-dover bill to tee. So buy half-a-dozen and raise your rates! ;-)