Small mouth bottles are difficult to clean and to fill with a water filter, or a drink mix.
For extended treks the internal frame pack should have a volume over 3,000 cubic inches (50 liters), but less than 4,200 cubic inches (70 liters).
The larger the pack, the greater the tendency to fill it with non-essentials.
The conventional wisdom used to be that external frames are for trail hiking and internal frames are for off trail hiking.
Most of our hiking is on trails, but the majority of Scouts and adult leaders prefer the internal frame and these have become the most commonly available packs.
Sleeping Pad & Pillow: A closed-cell type foam pad (e.g., insolite or the accordion style by Z-Rest work well) is good to keep out the cold and to preserve the sleeping bag.
Shorter length pads can be purchased, or longer pads can be cut, to reduce the amount of bulk and weight (head to knee length is sufficient).
Personal First Aid Kit: The Troop gear includes a fully stocked first aid kit, but you should also carry a personal first aid kit to handle minor problems.
Kits are typically “personalized”, but all kits should include moleskin (for blisters), several adhesive bandages of various sizes, a few gauze pads, adhesive tape, and disinfecting ointment.
Waterproof Pack Cover needs to be large enough to protect items strapped to the exterior of the pack.