This pack is totally solid. It’s make using awesome materials, huge zippers, with great internal organization. The Allpa would be an almost perfect pack with some slight tweaks to the backpack carry system.
I love Tortuga for their adherence to a simple design on all their bags. They are side opening, clamshell style backpacks, with separated compartments, comfortable carry system, and bombproof hardware.
The eBags Mother Lode Junior is a popular, inexpensive travel backpack, that’s often on sale for under $100. It has a simple design, carry on size dimensions, with a ton of great features!
