There are many here who are looking for a very lightweight, very inexpensive convertible bag for travel. We used to have the OPEC bag which seems to no longer be manufactured.
I came across this bag. It is slightly smaller than the OPEC, about the size of the RS Appenzell, weighs slightly more but costs just over $20.
(Yes, I'm aware it weighs more than the Appenzell but it is less than half the price and has hideaway backpack straps.)
Goodhope Convertible
Does anyone else know of a very lightweight, very inexpensive bag that can also be considered as an OPEC replacement?