I have an older model MLB Burn (
https://mountainlaureldesigns.com/product/burn-38l/) that I picked up cheaply from the US Backpacking Light gear swap forum. It doesn't have the padded hip belt of the newer models and it doesn't have the roll top closure. I use the Burn for up to 3 night trips and it works very well. More than 3 nights or alpine touring, I use an HMG Southwest in black DCH 150 (
https://www.hyperlitemountaingear.com/c ... -southwest) - love this pack.
I've made a few minor changes to the MLD Burn. It has plastic o rings on cross grain tabs around the pack sides and bottom that are there for shock cord compression straps that I have used to thread a lattice of shock cord on the back panel and attached a mini cord lock. I slide an offcut of blue CCF pad under the shock cord to form a back panel. The pad stops anything inside the pack poking you in the back, makes the pack very comfortable and adds a little structure to the pack. The CCF pad also doubles as a sit pad and easily slides in and out from the shock cord.
I made load lifters by attaching cord loops to the top Y compression strap and running cord and linelocs to D's on the shoulder straps - I love load lifters even when carrying a light load because it makes the pack hug your back.
Final mod was to create a roll top by attaching a male and female buckle to the O rings near the side of the rear mesh pocket - the newer models have the option for a dry bag style closure or a roll top, so you wouldn't need to do this.
I usually pack my quilt in the bottom, then food bag, clothes bag, utility gear, cook kit and then shove my MLD Trailstar in the top to fill spaces. Once used to packing it, it's amazing how much structure the pack has and it will usually stand up on its own. On day 2 of an overnight trip, once food is eaten and I'm not carrying much water, I don't use the hip belt. It' so comfortable to carry that it's like I don't have a pack.
I've taken the pack off trail a fair bit and it's stood up to rough treatment really well.
The downside would be waiting up to 12 weeks to have one made - I'd think seriously about what mods you would need and make a custom order. With the dollar so low, the Sonder seems like a good alternative and would support the local economy.