Providing surprising versatility and performance, the award-winning Ultra-Sil Day Pack by Sea To Summit is a minimalist must have for those hiking adventures or sight-seeing trips.  Featuring a handy 20L capacity, incredible strength-to-weight performance and is able to pack down to the size of a tennis ball.  Ultralight 15D high strength Ultra-Sil Nano nylon fabric  Exceptionally compact packable design  Siliconised nylon fabric for easy packing and water resistance  Asymmetrical zipper design for tiny packed size  Bar-tacks at stress points for added strength  Exceptionally compact