For those with bags without compression straps, a simple hack to compress your bag, just use a belt with buckle. This is decathlon NH500 escape 32L, great bag but no compression straps.

Hiking backpack 32L - NH Escape 500 QUECHUA

Zero Grid Travel Security Belt - Hidden Money Pouch

Luggage Straps High Elastic Suitcase Belt Anti pinch Buckles

Quechua NH Escape 500 32 L Hiking Backpack

Quechua NH Escape 500 Review

Ayaport Utility Straps with Buckle 40 Quick-Release

Hiking backpack 32L - NH Escape 500 - Decathlon

Hiking backpack 32L - NH Escape 500 - Decathlon

Hiking backpack 32L - NH Escape 500 QUECHUA

Quechua NH Escape 500 32 L Hiking Backpack

Carrying Strap with Handle, 2 Pack Adjustable Nylon Belt for

Hiking Backpack 23 L - NH 500 Yellow - Yellow ochre - Quechua

Hiking Backpack 23 L - NH 500 Yellow - Yellow ochre - Quechua

Carrying Strap with Handle, Adjustable Nylon Belt for Moving Boxes