In many parts of the northern hemisphere we are already seeing indications that fall is coming.
Here in the Seattle area, where Exped USA makes its home, this means folks in the office show up wearing long pants (gasp!) and flannel shirts. It also means that we wake up to more rainy days. Of course, we aren't about to stop going outside (bike commuting, hiking, paddling, backpacking, etc.), but it does mean we break out the waterproof packs for almost everything.
The Torrent series of packs includes sizes for a wide assortment of activities:
Torrent 20 - light day loads, bike commute excellence
Torrent 30 and 40 - extended days or even the occasional light overnighter. Torrent 30 hits a sweet spot and is capable of rolling down around smaller loads while handling bigger ones well. It's the do-it-all size here.
Torrent 50 - 50 liters of interior volume will haul a lot of gear. Great for canoe trips and rafting adventures.
Work and Rescue Pack 50 - ultra-durable fabric and internal gear separation walls (removable) as well as numerous internal gear anchors for ropes and hardware. Bright colors!
All these packs are durable roll-top packs and fully waterproof - not submersible, but waterproof for everything else. Except for the Torrent 20, each pack has multiple daisy chains on the exterior for attaching gear. All of them have strong haul loops and comfortable suspension systems - contoured shoulder straps, removable padded hip belts and a segmented back panel of foam and mesh.
Torrents are commonly used for technical adventures such as caving and canyoneering because of their combination of durability and waterproofness. But more often they are used as everyday packs in places where the weather is unpredictable - Seattle and Zurich come to mind (Exped offices in both locations!).