We travel within our own state year round (AZ), and none of the RV parks we stay at have recycling, so we toss everything in the dumpster. However, I've noticed a lot of RVers from the PNW, in particular, who keep bags outside their rigs to save their bottles and cans.
PLEASE don't do this, these bags will draw all kinds of bugs, not to mention the dreaded MICE, which will chew through your RV wiring in no time. Before we bought our rig, it had previous mouse damage (wiring!), which the old owner had to fix...which cost him thousands! If you "must" save your recyclables, please keep then IN your rig, so as not to attract mice to other people's rigs.
There was a lady in the last park we stayed at right next to us who kept her garbage can OUTSIDE her rig! I complained about it to the manager, but nothing was done. Go figure! Glad we moved on before the mice decided to set up "camp" under our motorhome.