Transient Bags sent me 2 of their hip pouches to test out last week. I rode all weekend with them, a small and a medium and they're seriously great. I have used other hip pouches before, but they're always so big and cumbersome. I was looking for smaller ones, but had a hard time finding them. These two sizes are perfect. When I wanna go ride somewhere and I don't want to carry my bag, the small fits everything I need:

-tube
-tire levers
-co2 cartridges
-digital camera
-cellphone
-park multitool [not pictured]

On the small pouch:
Length is roughtly 4 1/2" at the bottom to a 6 1/2" top.
Width is about 2"
Depth is about 4 1/2"

On the medium pouch:
Length is 6 1/2" to a 8 1/2" taper
Width is about 2"
Depth is about 5 1/2"

I could carry everything above in the medium as well as:

-iPod
-extra tube
-mini pump
-metric and standard allen key set

The medium has enough room to slide a ulock in the back as well, between the belt loops.

Both of these bags fit more practically for everyday use and I usually just keep the small pouch on during the day. They come in an assortment of colors and are available at their website.

Thanks Transient!