These things are selling like hotcakes

Craftable = Uncraftable

http://www.tf2outpost.com/trade/23586559 ~ Sold for 5 ref (1 day)

http://www.tf2outpost.com/trade/23583615 ~ 5 ref (1 day)

http://www.tf2outpost.com/trade/15572973 ~ multiple adds for 5 ref

http://www.tf2outpost.com/trade/23584399 ~ 4.88 (1 day)

http://www.tf2outpost.com/trade/23592893 ~ 4.66 ref (1 day)

http://www.tf2outpost.com/trade/21603002 ~ at least 1 sold for 4.44 ref

http://www.tf2outpost.com/trade/23592181 ~ 4.33 ref (1 day)

http://www.tf2outpost.com/trade/23582158 ~ Sold for 4 ref (1 day)

http://www.tf2outpost.com/trade/23593428 ~ 2 adds for 4 ref (1 day)

http://www.tf2outpost.com/trade/23582158 ~ 4 ref (1 day)

http://www.tf2outpost.com/trade/23602351 ~ offered 4 ref, offered 4.33 ref

http://www.tf2outpost.com/trade/23586255 ~ 3.88 ref (1 day)

Making a large range because everything is quickselling.

Let me know if there are any issues.

Edit: http://backpack.tf/classifieds/?item=Backpack%20Expander&quality=6&tradable=1&craftable=0 nothing under 4.88 at time of writing.