Petzl Super Avanti
A classic design popular with British cavers, it is a good combination of durability and low bulk. It has dyneema equipment loops and the leg loop reinforcement is TPU (much like PVC). It is quick to adjust, intuitive to put on, and is a good balance between comfort and simplicity. Also relatively light for those who are flying (although some are lighter).
Please specify Size 1 (waist 60cm - 95cm), or Size 2 (waist 90cm - 105cm)