Sea to Summit’s new Ultra-Sil Daypack fits in the palm of your hand when it’s in its tiny carrying pouch, and easily tucks into your travel bag or glove compartment. Yet this 2.4-ounce, super-compact bundle expands to a 20-liter backpack that’s perfect for packing up a jacket, guidebook, water bottle, and camera while you’re out exploring, or for stashing souvenirs for the journey home. Its reinforced zippers and seams and the durable Cordura fabric can support a hefty load, and its eco-friendly, siliconized finish repels water. The best part: It doesn’t require brute strength to squish the bag back into its attached stuff sack. It sells for $27.95 at REI (800-426-4840; www.rei.com), or contact Sea to Summit (303-440-8977; www.seatosummit.com).