...another item to consider because of it's multi-use is a reusable foldable bag...1) The grocery stores in Spain do not provide bags ( you can buy them ) but they prefer you honor the earth and bring your own 2) it serves as my under the seat carry on when flying with the bits I don't put in my backpack in the overhead 3) it's the most fabulous 'catch all / hold all' using an 's' hook to hold it over the shower door...throw everything you need in it and you're on your way to the shower.( soap, razor, clean clothes, comb, deodorant, towel ) ...throw everything in it again to head to the laundry ( laundry soap, dirty clothes, clothes pins ) ...Cool huh?
Many different ones available, mine happen to be by Rume and Land's End, plenty on eBay & Amazon