Yes, check out the Osprey Daylite Plus which was voted the best daypack in our article – https://southeastasiabackpacker.com/travel-daypack/

Hi Will,
If you’re going to be climbing (or riding a motorbike up) any high-ish mountains then yes, it would absolutely be a good idea. Even at lower altitudes near the equator you can be surprised by how chilly it can get at night. Obviously, the smaller/lighter the better, as you don’t want to be weighed down. Don’t forget, you’ll also find it pretty easy to find something once you’re out here, so don’t worry too much if you don’t have a chance to get anything before you leave. That way, you can get a feel for things when you arrive and help out the local economy if you need to buy anything.
Have a great time!