I'm relatively new to this forum and have spent some time combing through some old posts to see if I could figure out a solution to my packing conundrum for my international travels this summer, but I have some unique requirements, and am still undecided as to what to do.
So here's my situation:
– I'm going to be doing research Mongolia for 6 weeks this summer. My research involves cows and sheep. So I need to bring my laptop (5.5 lbs) and my muck boots, which weigh about 2 lbs. and are gonna be pretty awkward to pack.
– I hiked the Colorado Trail two years ago – I upgraded my gear to lightweight stuff but stopped short of buying a new backpack and sleeping bag, because I only had so much money. My current backpack I've had since 2004, and it weighs 2.25 lbs. My sleeping bag is rated for zero degrees, but it weighs 3.6 lbs.
– I will be staying in indoor accommodations at some points, but I'm also planning on sleeping in my tent and doing some multi-day treks. I'm not sure of all of the logistics of my trip, in terms of if I'll be able to leave stuff (i.e. boots and laptop) somewhere so I don't have to carry them while hiking, so I'm having to make a decision about buying a pack without that knowledge.
– I had been thinking about buying the Gossamer Gear Mariposa backpack, but after reading some posts on here, it sounds like this bag might not be durable enough for airline/hostel/train/etc travel. Now I'm considering the GoLite Jam – would that hold up better? I'm thinking about thru-hiking again in the future, so if I buy a new (large) backpack now for this trip, I'd like it to also work for future thru-hikes.
– Or I could get a daypack, either in addition to, or instead of, a large hiking backpack. One option is getting two packs, and packing the day pack empty inside my larger backpack, and pulling it out when I'm at my destinations and need to use it for day hikes. Another option is to buy just the daypack, pack it with stuff, and then buy a duffle bag to go with it (but I don't currently have a good sized duffle bag).
If I do get a new daypack, I want to be able to use it for every day school/work, so in other words, a super compressible daypack probably won't work. I'm particularly partial to the Osprey Comet, but am open to other suggestions.
– I'm also considering getting another sleeping bag, but don't know if it's worth it right now to spend money on a bag when I'm going to be carrying other heavy stuff anyway. If I do get a new bag, though, I'm thinking something that ideally weighs under 2 lbs and is compressible as possible.
So any suggestions how to best to spend my money would be welcome. I don't have a set budget for this gear, but I don't have unlimited funds, either.

