When staying in a hostel, especially one with a crowded or minimal kitchen, you need protein sources that are shelf-stable, "no-cook," and compact. The most reliable staples are canned tuna, salmon, or chicken, which now often come in convenient, lightweight tear-open pouches that don't require a can opener. Nut butters (peanut, almond, or cashew) are high-protein and calorie-dense, making them perfect for spreading on bread or apples. Greek yogurt is an excellent fresh option if you have access to a shared fridge, providing significantly more protein than regular yogurt. For snacks, beef or soy jerky, roasted chickpeas (chana), and protein bars are essential. If you have access to a kettle, couscous or high-protein instant noodles mixed with a pouch of tuna can create a complete meal in minutes. Finally, hard-boiled eggs are often sold pre-peeled in convenience stores (like 7-Eleven in Asia or Europe) and are a perfect, portable "complete protein" to keep in your day bag for energy during long sightseeing tours.