If you want a super lightweight, compact bag to carry your basics, the Sea to Summit Ultra-Sil travel day pack is a great option, whether you need a summit pack while hiking or a travel tote for town.
Features
Made with ultralightweight, high-strength 15-denier Ultra-Sil Nano nylon fabric
Siliconized nylon fabric is water-resistant and aids in easy packing
Exceptionally compact packable design folds down to the size of an egg
Asymmetrical zipper design makes for a tiny packed size