The Cotopaxi Allpa 35L is the one that made the most sense for my Spain trip if I commit to the backpack route. It has the same layout I liked in the 28L, but the extra depth makes packing way smoother—my cubes fit without a fight and it zipped easily. The padded waist strap actually helps with weight, and I like that I still have room for things like sandals or souvenirs.