When comparing Crumpler "Rampaging Mob" M/L vs Tortuga Air (27L, 35L expanded), the Slant community recommends Crumpler "Rampaging Mob" M/L for most people. In the question“What is the best replacement for the discontinued Crumpler Big Belly backpack?” Crumpler "Rampaging Mob" M/L is ranked 1st while Tortuga Air (27L, 35L expanded) is ranked 3rd. The most important reason people chose Crumpler "Rampaging Mob" M/L is:
Rather than the shoulder straps only being stitched on to the pack, they are connected with the same piece of fabric used on the back of the pack. This adds strength/durability to the shoulder straps.
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Pros
Pro Straps integrate into the bag structure for strength
Rather than the shoulder straps only being stitched on to the pack, they are connected with the same piece of fabric used on the back of the pack. This adds strength/durability to the shoulder straps.
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 May not be available everywhere
www.crumpler.eu doesn't list it, and it does not appear in the usual suspects (i.e. Amazon). It might need to be ordered from Australia and shipped.
Con Laptop compartment is not seperate from main compartment
In the Big Belly the laptop compartment cannot be opened whilst worn, protecting the laptop to a degree.
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.