China Guy, glad to see you trying out the next great adventure!
A couple of suggestions for shorter warm-up backpacks to get your feet:
- Stewart Lake and 8-mile lake in the Enchantments. Both are 3 mile hikes in- and require permits. But neither is as popular (nor as difficult!) as the Enchantments Core or Snow Lake. The PCT actually really isn’t far away. You can get permits online or walk-up. Everyone else in line will be going for Core!
- Goat Rocks wilderness (SnowGrass flats). No permit, or at least it didn’t used to, but this is a spectacular place (and nearly every PCTers favorite part of the whole trail). It is crowded, but for a reason
- Snow Lake/ Gem Lake - once again near teh PCT, but a simpler out and back.
For all of them I would recommend 2 nights- hike in, camp, day hike and enjoy the wilderness and return to y7our tent, and then hike back out.
If you want to really get into backpacking, go to Canadian National and Provincial Parks (Banff, Yoho, Jasper, Mt. Robson, etc.). They have excellent reservation system. As well as well-contructed tent sites, with picnic tables, bear and animal food storage protection, and nearby water.
10-12 miles are long days for most new backpackers. Look at PCT journals, they start with ultralight packs and still only do 8-10 miles per day for teh first several hundred miles. If newbies are hiking 10-12 miles (repeatedly) is not going to be a fun trip. Take it easy and enjoy (at least until you have worked out your gear). I have probably done 50 backpacking trips- and probably several hundred more days camping, but I have only ever done >7 nights once. Between work and just the logistics, it is difficult, but I find a good 4-5 day trip is usually perfect for accomplishment and remoteness without requiring too much food, too much water, and too many clothes (to prep for all weather).
I have done the J Section, and it’s great and spectacular. But I think an out and back on it would be absolutely fine (off i90 direction would be more people, but also a little more open views) so rather than having to crush it to go the whole length do what you can for 2 days and still be happy and then decide whether to just do an out and back vs. making a sprint for it.
Other thoughts:
“Make” your own food - we do angel hair pasta and (self) dehydrated tomato sauce with lots of parmesean, dehydrated rice+brocolli and chicken from a pouch, chicken marbella, Cheese and Cheezits for some go to dinners. Oatmeal with milk powder + dried fruit for breakfasts. Poptarts, or peanut butter and flour tortillas for lunch (moose goo on tortillas is my teen daughter’s food for breakfast and lunch for up to 5 days in a row). Snickers, nuts, and dried fruit mixed in and you have 4 days of food. Dehydrated pineapple carrot coleslaw is a recent lunch addition. Carrots and apples last fresh until day 3 (but are heavy with water). We take one pot to boil water (only), a cup, a bowl, and a spoon for each person. The pouches are just not worth it. Buy the cheapest dehydrator and you will make your money back in no time. Cook the dinner at home and dehydrate it (dehydrated rice is 20% of the time and effort as minute rice for instance). Cleverhiker and backpackerchef have some simple ideas to get started.
Water treatment- just get the Sawyer squeeze/gravity filter or Katahdyn tabs. Mechanical pumps are just a PITA.
Don’t gear up- use what you have
Stoves- everyone likes their own setup. But get one that fits in your pot for each carrying. MSR Whisperlight (and precursors) has been my standard for 30 years. I would probably move to a JetBoil given our only boiling water. (Actually, I would personally vote no stove and no cooking, but my partner wants hot tea with breakfast and dinner so thus “just boiling water” is teh middle ground.)