Tortuga Outbreaker Daypack vs. Portland Gear Cascade Backpack Standard

Two carry-on travel backpacks, compared spec for spec.

Tortuga Outbreaker Daypack

Front facing view of the Tortuga Outbreaker Daypack
Capacity21 L
Weight0.5 kg
Dimensions43×28×17 cm
Airline fit96%
Price$125

Feature by feature

Tortuga Outbreaker DaypackFeaturePortland Gear Cascade Backpack Standard
Storage
N Compression N
None Expanded Capacity None
0 Opening 0
front Passport side
N Passthrough Y
Carry
Y Backpack Y
N Hip Belt N
removable Sternum Strap Y
Inside
15in Laptop 15in
2 Main Compartments 2
N Organizer Y
Outside
× Hard Shell ×
N Rain-fly N
2, side Water Bottle Holder 2, side
Y Water Resistant Y
Material
X-Pac waterproof sailcloth100% polyester with TPU matte coating

Portland Gear Cascade Backpack Standard

Front facing view of the Portland Gear Cascade Backpack Standard
Capacity21 L
Weight1.1 kg
Dimensions41×28×22 cm
Airline fit75%
Price$110

Key differences between the Tortuga Outbreaker Daypack and Portland Gear Cascade Backpack Standard

Both have: backpack straps, laptop sleeve, water bottle pockets, water resistant.

Which airlines take each bag as a carry-on

We checked both bags against the carry-on size limits of 189 airlines. 142 accept both. 39 accept only the Tortuga Outbreaker Daypack, and 0 accept only the Portland Gear Cascade Backpack Standard.

Only the Tortuga Outbreaker Daypack fits

Air Baltic, Air China, Air Malta, Air Niugini, Air Serbia, Air Seychelles, Air Tahiti, American Eagle, Asiana Airlines, ATA Airlines, Belavia, Blue Air, Bulgaria Air, China Eastern, easyJet, Emirates Airlines, Enter Air, flybe, Icelandair, InselAir, Juneyao Airlines, Liat Airlines, Luxair, Meridiana Fly, Nordwind Airlines, Royal Brunei Airlines, Ryanair, S7, Shandong Airlines, Shenzhen Airlines, Sun Express, TAP Air Portugal, TAROM, Tianjin Airlines (A320 & E190), TUI, Ukraine International, VIM Airlines (Closed), Volotea, Xiamen.

Tortuga Outbreaker Daypack vs. Portland Gear Cascade Backpack Standard: which should you pack?

The Tortuga Outbreaker Daypack carries the same capacity as the Portland Gear Cascade Backpack Standard (21L vs. 21L), while the Tortuga Outbreaker Daypack is the lighter pack at 0.5kg (vs. 1.1kg). For carry-on flexibility, the Tortuga Outbreaker Daypack fits 96% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the Tortuga Outbreaker Daypack; if you want to travel lighter, the Tortuga Outbreaker Daypack is the better call.