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 Review

Hiking Backpack 32 L - NH Escape 500 Black - black, Hazelnut

Quechua NH Escape 500 32 L Hiking Backpack

Designed for your day hikes. It's also perfect for trips to the farmers' market or the local fruit shop.

Hiking Backpack 32 L - NH 500 Grey/Black

Hiking backpack 32L - NH Escape 500 - Decathlon

Decathlon NH500 Escape (32 liter) fits under seat on Boeing 737

Hiking backpack 32L - NH Escape 500

Hiking backpack 32L - NH Escape 500

Hiking Backpack 32 L - NH Escape 500 Black - black, Hazelnut

Ayaport Utility Straps with Buckle 40 Quick-Release

Ayaport Utility Straps with Buckle 40 Quick-Release

Quechua Hiking backpack 32L - NH Escape 500 Rolltop

Utility Straps with Buckle Quick-Release Adjustable Nylon Straps