JANSBEN Hiking Backpack 40L, Lightweight Rucksack Men Women Outdoor Sport Tactical Trekking Military Travel Camping Daypack

Q: Does it hold a water bladder?

Yes it would hold a bladder. The outdoor backpack have a hole for the drink tube or clips on the main zipped compartment, there are a Velcro to fix the hydration bag on the main bag. I like this 40l travel backpack, it can hold two sets of trekking poles, nice hiking partner.

Q: Is it tiring after carrying it for a long time?

There are breathable mesh padded around the shoulder straps and back that distribute and reduce pressure, I use it for hiking and camping, it's great so far.