Modern internal-framed backpacks, tents, sleeping bags and stoves can all be rented in various places in Calle Plateros from around S10 per item per day. Check all equipment carefully before you agree to rent it, as some is pretty shoddy and rarely is it lightweight. For the cheapest deals on new gear, head to El Molino. Other essentials include sturdy shoes, rain gear, insect repellent, sun- block, a flashlight (with fresh batteries), basic first-aid supplies and water-purification tab- lets. Once you’re trekking, there is usually nowhere to buy food, and the small villages where treks begin have very limited supplies, so shop in advance in Cuzco. If you’re on a guided trek, take a stash of cash for tipping the guide and the arrieros. About US$10 per day per trekker is the minimum decent tip to a guide; a similar amount to divide between group arrieros is appropriate.