Lowe Alpine's Lightflite 2 has a single main compartment and two external mesh pockets with a cinch cord to keep contents in place.
Lowe Alpine says:
When the mountain trails are calling your name, skip, run and jump free with our lightest weight, technical belt pack, the Lightflite 2.
The sun might be shinning but it is always sensible to pack a windproof for the time spent at the summit checking out your route back down. Pack that jacket away in this sleekly designed hip pack with its two fast access pockets for a energy bar or two. Then keep comfortable with the padded wicking belt and safe with a reflective LED light loop as you complete your fast-and-light blast in the hills.