Travelon 2-Sided Packing Cube Medium 

"This item is ok for infrequent use. I have the Eagle Creek brand ones and they are much better. There are double zippers on the Eagle Creek and the zippers themselves are smoother. I was being cheap and bought the Travelon since they were on sale, but I should have just waited for the Eagle Creek to go on sale."

"I use this bag in conjunction with a shoe bag to pack for up to 5 days in a single extra large tote. Having the clothes and shoes in cubes keeps them separate and organized so I can find all the other things (toiletries, travel essentials, book, etc) in my tote. I have packed up to 5 days of clothes in this cube, and I'm by no means a minimalist. The "clean clothes" side is vented and the "dirty" side is unvented and lined in plastic, which is great when you can't do laundry on the road. When I'm packing a larger suitcase instead of my tote, I do not use cubes. I find they just adds bulk without adding any function. Love it for my tote though."