I love mesh packing cubes for my large suitcase which I check on flights. For my backpack however, I want to put my emergency change of clothes in something liquid-resistant, since I often also pack food and beverages in there. Know of any brands out there, or another equivalent solution?
What you seem to need are waterresistant rolling bags like that. Ortlieb is a well-known brand name, but also a bit expensive. If you look out in outdoor stores or motorbike stores (they have often inexpensive bags which are used to store things which should not get wet), you should be able to get an inexpensive brand.
The Eagle Creek Specter cube series seems to be just what I am looking for. Still a packing cube design for easy access, but non-mesh for liquid protection. On top of that, it is translucent to allow cursory inventorying, and is supposed to be especially light. I'll let you all know how my purchase fares.