Stagnant water (like that found in lakes and tarns) contains more contaminants and will clog up filters more quickly, as well as having a funky taste for drinking
MSRP: $425 Best for: Mountaineering, ski mountaineering Volume: 40 L Weight: 2.2 lbs Airbag: No Ski Carry/Snowboard carry: Yes/No Back panel: Integrated 1/4" foam back panel pad and plastic stiffener Hydration compatible: No Ice axe carry: Yes, internal Warranty: 1 year Pockets: 4+ main compartment What we liked: One of very few ultralight packs that can carry skis, fabric is durable, carries weight surprisingly well for its weight What we didn't like: Lacks some ski features The Hyperlite Mountain Gear Prism was previously an award winner for best for multi-day/ski mountaineering, but since then, Hyperlite has come out with a handful of new ski-specific pack designs
If though you're using a boat to go from one fishing location to another it might be a good idea to cover the reel to keep sprays out of the drag assembly
Some nylon packs include waterproof pack covers, including the Osprey Aether 65
However, if you frequently travel on public transport, you may want something better suited to crowded spaces