I have many of Arc'Teryx different backpacks, in addition to a lot of their clothes and other gear. Simply, because I have found out that it is the BEST. I'm doing a lot of Scouting, high adventure, backpacking, camping both in the US and in Northern Europe. Silo 50 Backpack has a lot of space, easy to pack and to reach into(from top and side)One big main compartment, one big pocket of the front and a big, very useful pocket on the top. It is a ''roll-over'' closing at the top, very easy to handle. A couple of great adjustment straps.The internal frame, back support, shoulder straps and hip belt is very comfortable and well adjustable. It creates a good unit with your body. There is a lot of volume in this bag, if you don't need it all, just adjust the straps tighter. I use Silo 50 for many Scout backpacking-trips for long weekends, My Bora 80 or Naos 70 for longer high adventure trips. I am a quite minimalistic backpacker, but bring all I need for a comfortable trip and get it all + stove, fuel and food into my bag. Inside pocket for Water Bladder and a small water bottle pocket on the outside. Only thing I miss is a hook to fix the Water bladder to. I use the big compartment for my Big Agnes Mummy Air mattress, Marmot EQ sleepingbag, MSR stove, fuel bottle, Water bladder and clothes I don't need to reach quickly. Rain gear, gloves, beanie, snacks,tooth brush, First Aid kit etc in the top and front pockets. I always pack in Zip bags or water tight compressible bags. The ''Top-roll'' can come in contact with your neck and I place a fleece neckerchief there to stretch my head against. I have not carried skies on it yet, but there is a couple of very good ''rubbered'' straps to fix extra equipment with.