Knack Pack Large

The Series 2 Large is 30 L when closed and 46 L when expanded, with a separate 16 L packing section. Knack says that compartment is sized for roughly 3 to 4 changes of clothes. [Knack product page](https://knackbags.com/collections/featured-expandable-backpacks/products/series-2-large-expandable-knack-pack)

Yes, its padded side-zip computer pocket is listed for up to a 17-inch laptop, and the pocket is suspended behind the back panel. That is different from the catalog description's stated 32 L capacity. [Knack product page](https://knackbags.com/collections/featured-expandable-backpacks/products/series-2-large-expandable-knack-pack)

Knack labels it underseat on all jets when unexpanded and overhead on all jets when expanded. Its listed depth changes from 4.5 inches to 9.5 inches when the travel compartment is opened. [Knack product page](https://knackbags.com/collections/featured-expandable-backpacks/products/series-2-large-expandable-knack-pack)

The Series 2 listing describes 420-denier high-density nylon with a PU water-resistant coating and an 840-denier ballistic nylon bottom. It weighs about 3 lb 4 oz and is tested to carry loads up to 40 lb. [Knack specifications](https://knackbags.com/products/series-2-large-expandable-knack-pack-factory-seconds-copy)