When comparing Peak Design Everyday Backpack vs Tortuga Air (27L, 35L expanded), the Slant community recommends Tortuga Air (27L, 35L expanded) for most people. In the question“What is the best replacement for the discontinued Crumpler Big Belly backpack?” Tortuga Air (27L, 35L expanded) is ranked 3rd while Peak Design Everyday Backpack is ranked 4th. The most important reason people chose Tortuga Air (27L, 35L expanded) is:
The bag can expand from 27L to 37L. The bag can have a slimmer profile when you aren't carrying as much stuff, but it can expand by 8L when you want the extra capacity.
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Pros
Pro Does not turn into a black hole
Side access theoretically makes accessing items in the main compartment easier.
Pro Lots of options for external carry
Many hidden straps and ways to mount stuff to carry extra stuff.
Pro Separate laptop opening
Unfortunately not secure like the Big Belly.
Pro Expansion zipper means you don't have to carry unnecessary bulk
The bag can expand from 27L to 37L. The bag can have a slimmer profile when you aren't carrying as much stuff, but it can expand by 8L when you want the extra capacity.
Pro Locking zippers to keep the contents of your bag safe
There are locking zippers on the laptop, front and main compartments.
Cons
Con All the weight will be on your shoulders
The bag does not come with a hip belt, so all the weight in the pack will be on your shoulders.