Pick any two backpacks and see them side by side on every published spec. Capacity is the volume you carry the trip in, weight is what rides empty, rated load is how much the suspension carries, and the better spec in each row is highlighted. A blank spec never wins.
Left backpack Arc'teryx Aerios 45 Arc'teryx Alpha AR 55 Arc'teryx Bora 65 Arc'teryx Bora 75 Deuter Aircontact Core 60+10 Deuter Aircontact Lite 50+10 Deuter Aircontact Ultra 50+5 Deuter Futura Air Trek 50+10 Durston Kakwa 40 Durston Kakwa 55 Durston Wapta 30 Exped Lightning 60 Fjallraven Kajka 55 Fjallraven Kajka 65 Fjallraven Singi 48 Gossamer Gear Fast Kumo 36 Gossamer Gear Gorilla 50 Gossamer Gear Kumo 36 Gossamer Gear Mariposa 60 Granite Gear Blaze 60 Granite Gear Crown3 60 Granite Gear Crown3 60 Women's Granite Gear Perimeter 50 Granite Gear Virga3 55 Gregory Baltoro 65 Gregory Deva 60 Gregory Focal 58 Gregory Katmai 55 Gregory Maven 55 Gregory Paragon 60 Gregory Zulu 55 Hyperlite Mountain Gear Junction 55 Hyperlite Mountain Gear Southwest 40 Hyperlite Mountain Gear Southwest 55 Hyperlite Mountain Gear Unbound 40 Hyperlite Mountain Gear Unbound 55 Hyperlite Mountain Gear Windrider 40 Hyperlite Mountain Gear Windrider 55 Kelty Glendale 65 Kelty Zyp 48 Mystery Ranch Bridger 65 Mystery Ranch Coulee 50 Mystery Ranch Radix 57 Osprey Aether 65 Osprey Ariel 65 Osprey Atmos AG 65 Osprey Aura AG 65 Osprey Eja 58 Osprey Exos 48 Osprey Exos 58 Osprey Exos Pro 55 Osprey Levity 45 Osprey Renn 65 Osprey Rook 65 Osprey Talon 44 Pa'lante Desert Pa'lante V2 REI Co-op Flash 55 REI Co-op Flash Air 50 REI Co-op Trailmade 60 REI Co-op Traverse 60 Sierra Designs Flex Capacitor 40-60 Six Moon Designs Minimalist V2 Six Moon Designs Swift V Six Moon Designs Swift X ULA Catalyst ULA CDT ULA Circuit ULA Ohm ULA Ultra Circuit Zpacks Arc Haul Ultra 50 Zpacks Arc Haul Ultra 60 Zpacks Arc Zip Ultra 62 Zpacks Nero Classic 30
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Right backpack Arc'teryx Aerios 45 Arc'teryx Alpha AR 55 Arc'teryx Bora 65 Arc'teryx Bora 75 Deuter Aircontact Core 60+10 Deuter Aircontact Lite 50+10 Deuter Aircontact Ultra 50+5 Deuter Futura Air Trek 50+10 Durston Kakwa 40 Durston Kakwa 55 Durston Wapta 30 Exped Lightning 60 Fjallraven Kajka 55 Fjallraven Kajka 65 Fjallraven Singi 48 Gossamer Gear Fast Kumo 36 Gossamer Gear Gorilla 50 Gossamer Gear Kumo 36 Gossamer Gear Mariposa 60 Granite Gear Blaze 60 Granite Gear Crown3 60 Granite Gear Crown3 60 Women's Granite Gear Perimeter 50 Granite Gear Virga3 55 Gregory Baltoro 65 Gregory Deva 60 Gregory Focal 58 Gregory Katmai 55 Gregory Maven 55 Gregory Paragon 60 Gregory Zulu 55 Hyperlite Mountain Gear Junction 55 Hyperlite Mountain Gear Southwest 40 Hyperlite Mountain Gear Southwest 55 Hyperlite Mountain Gear Unbound 40 Hyperlite Mountain Gear Unbound 55 Hyperlite Mountain Gear Windrider 40 Hyperlite Mountain Gear Windrider 55 Kelty Glendale 65 Kelty Zyp 48 Mystery Ranch Bridger 65 Mystery Ranch Coulee 50 Mystery Ranch Radix 57 Osprey Aether 65 Osprey Ariel 65 Osprey Atmos AG 65 Osprey Aura AG 65 Osprey Eja 58 Osprey Exos 48 Osprey Exos 58 Osprey Exos Pro 55 Osprey Levity 45 Osprey Renn 65 Osprey Rook 65 Osprey Talon 44 Pa'lante Desert Pa'lante V2 REI Co-op Flash 55 REI Co-op Flash Air 50 REI Co-op Trailmade 60 REI Co-op Traverse 60 Sierra Designs Flex Capacitor 40-60 Six Moon Designs Minimalist V2 Six Moon Designs Swift V Six Moon Designs Swift X ULA Catalyst ULA CDT ULA Circuit ULA Ohm ULA Ultra Circuit Zpacks Arc Haul Ultra 50 Zpacks Arc Haul Ultra 60 Zpacks Arc Zip Ultra 62 Zpacks Nero Classic 30