The OP is starting in April and while it can get chilly in early April, it isn't exactly winter.
Here's picture of all the gear I'll be taking to Colorado in September (if all goes well).
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This all fits into the 65L pack with room to spare for a weeks worth of food.
From top to bottom, left to right we have stuff sack for bag, the bag with CoolMax liner on top of a Neoair pad.
Assortment of clothes, Fleece pull over, tent (SMD Trekker), a light fleece lined nylon vest, pack cover, bug net hat, Crusher hat, fleece hat, neck gaiter, scarf, gloves, Gortex jacket, Sawyer Squeeze filter and bag, gallon water bag, big cell phone and battery pack, headlamp, pack towel, tent stakes, cooking pot, fuel cylinder, burner, waterproof plastic box with odds and ends in it. Tyvak ground sheet and a piece of close cell foam for sitting on and putting under the Neoair for extra insulation under my hips. The whole deal weights about 16 pounds.