Seasoned backpackers know that weight accumulates mysteriously and quickly when packing. For those gear intensive trips that are more than a couple of nights long, the Altra LT 75 manages mammoth amounts of equipment without feeling too heavy. Thanks to the aluminum stays and 4-way adjustable GridLock shoulder straps, the Altra LT 75 is incredibly comfy without loosing customization for your specific body type. The C2 suspension system sits slightly off your back, allowing for air ventilation while you cruise up the switchbacks and the Rotating Load Transfer Disc pivots to keep the pack weight centered over your hips through scree sliding and talus traversing. The Altra LT 75 swallows gear like a black hole, so Arc'teryx equipped it with a full U-zipper, allowing access through the worm hole for stuff that would otherwise be lost in the deep space of traditional top-loading only packs. The large "floating brain" lid contains two pockets and is specifically designed to hold a hydration bladder so you don't have to deal with the main compartment when refilling water. The two Wingman pockets hold anything from a camera to extra layers, keeping oft used items within easy reach. An A-frame ski carry system and daisy chain climbing gear loops ensure that you'll be able to strap on whatever climbing and ski gear doesn't fit in your pack. Bottom Line: if you can't fit it in this pack, it might be time to hire a Sherpa. For all your Sherpa-less adventures, let the Altra LT do the heavy lifting.