Shopify miltiple add to cart
https://freakdesign.com.au/blogs/news/add-multiple-products-to-cart-without-permalinks
http://www.codeshopify.com/blog_posts/how-to-add-multiple-products-with-an-ajax-cart
убери add-to-cart-js
{% if product.available %}
{% assign hide_default_title = false %}
{% if product.variants.size == 1 and product.variants.first.title contains 'Default' %}
{% assign hide_default_title = true %}
{% endif %}
<div class="price-variants-block">
<form id="product-{{ product.id }}" action="/cart/add" method="post" class="variants">
{% if product.metafields.bundle contains 'section_title' %}
<h3>{{ product.metafields.bundle.section_title }}</h3>
{% endif %}
{% if product.metafields.bundle contains 'first_collection' or product.metafields.bundle contains 'second_collection' or product.metafields.bundle contains 'third_collection' %}
<ul class="select-list">
{% if product.metafields.bundle contains 'first_collection' %}
<li class="option" data-option="option1">
{% if product.metafields.bundle contains 'first_collection_title' %}<p class="price">{{ product.metafields.bundle.first_collection_title }}</p>{% endif %}
<ul>
{% assign first_collection = product.metafields.bundle.first_collection %}
{% for product in collections[first_collection].products limit:100 %}
<li>
<label>
<input type="checkbox" class="bundle-checkbox" value="{{ product.selected_or_first_available_variant.id }}" name="id[]">
{{ product.title }}
</label>
</li>
{% endfor %}
</ul>
</li>
{% endif %}
</ul>
{% endif %}
<input type="submit" id="add-{{ product.id }}" class="btn btn-lg" value="ADD TITLES TO CART " name="add" {% comment %}onclick="Shopify.addItemFromForm('product-{{product.id}}'); return false;"{% endcomment %} />
</form>
</div>
{% else %}
<div class="sold-out">
<span class="price">{{ 'products.product.sold_out_html' | t }}</span>
</div>
{% endif %}