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.

Quechua NH Escape 500 32 Review (Budget Travel Backpack)

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

Utility Straps with Buckle Quick-Release Adjustable Nylon Straps

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 - Decathlon

Quechua NH Escape 500 Review

Rescue Throw Rope Bag with 100ft Floating Line, Whistle Buckle for

Quechua NH Escape 500 32 L Hiking Backpack

Alician Rope Tighter Cargo Strap Luggage Belt Tightening Tie Down

Carrying Strap with Handle, Adjustable Nylon Belt for Moving Boxes

Quechua NH Escape 500 Review

Waist Strap Backpack